Region 16  Great Basin Region -- The drainage of the Great Basin that
           discharges into the states of Utah and Nevada. Includes Parts
           of California, Idaho, Nevada, Oregon, Utah, and Wyoming.


  Subregion  1601 -- Bear: The Bear River Basin. Idaho, Utah, Wyoming.
                       Area =     7310 sq.mi.

    Accounting Unit 160101 -- Upper Bear: The Bear River Basin above
                              Stewart Dam. Idaho, Utah, Wyoming.
                                Area =     2800 sq.mi.

      Cataloging Units  16010101 -- Upper Bear. Utah, Wyoming.
                                      Area =     1970 sq.mi.
                        16010102 -- Central Bear. Idaho, Utah, Wyoming.
                                      Area =      834 sq.mi.

    Accounting Unit 160102 -- Lower Bear: The Bear River Basin below
                              Stewart Dam. Idaho, Utah.
                                Area =     4510 sq.mi.

      Cataloging Units  16010201 -- Bear Lake. Idaho, Utah.
                                      Area =     1220 sq.mi.
                        16010202 -- Middle Bear. Idaho, Utah.
                                      Area =     1210 sq.mi.
                        16010203 -- Little Bear-Logan. Idaho, Utah.
                                      Area =      928 sq.mi.
                        16010204 -- Lower Bear-Malad. Idaho, Utah.
                                      Area =     1150 sq.mi.


  Subregion  1602 -- Great Salt Lake: The Great Salt Lake Basin
                     excluding the Bear River Basin. Idaho, Nevada,
                     Utah, Wyoming.
                       Area =    28700 sq.mi.

    Accounting Unit 160201 -- Weber: The Weber River Basin. Utah,
                              Wyoming.
                                Area =     2430 sq.mi.

      Cataloging Units  16020101 -- Upper Weber. Utah, Wyoming.
                                      Area =     1170 sq.mi.
                        16020102 -- Lower Weber. Utah.
                                      Area =     1260 sq.mi.

    Accounting Unit 160202 -- Jordan: The Jordan River Basin. Utah.
                                Area =     3830 sq.mi.

      Cataloging Units  16020201 -- Utah Lake. Utah.
                                      Area =     1340 sq.mi.
                        16020202 -- Spanish Fork. Utah.
                                      Area =      993 sq.mi.
                        16020203 -- Provo. Utah.
                                      Area =      710 sq.mi.
                        16020204 -- Jordan. Utah.
                                      Area =      791 sq.mi.

    Accounting Unit 160203 -- Great Salt Lake: The Great Salt Lake
                              Basin, excluding the Bear, Weber,  and
                              Jordan River Basins. Idaho, Nevada,
                              Utah.
                                Area =    22400 sq.mi.

      Cataloging Units  16020301 -- Hamlin-Snake Valleys. Nevada, Utah.
                                      Area =     3100 sq.mi.
                        16020302 -- Pine Valley. Utah.
                                      Area =      732 sq.mi.
                        16020303 -- Tule Valley. Utah.
                                      Area =      928 sq.mi.
                        16020304 -- Rush-Tooele Valleys. Utah.
                                      Area =     1180 sq.mi.
                        16020305 -- Skull Valley. Utah.
                                      Area =      798 sq.mi.
                        16020306 -- Southern Great Salt Lake Desert.
                                    Nevada, Utah.
                                      Area =     5420 sq.mi.
                        16020307 -- Pilot-Thousand Springs, Nevada,
                                    Utah.
                                      Area =     1780 sq.mi.
                        16020308 -- Northern Great Salt Lake Desert.
                                    Nevada, Utah.
                                      Area =     4650 sq.mi.
                        16020309 -- Curlew Valley. Idaho, Utah.
                                      Area =     1930 sq.mi.
                        16020310 -- Great Salt Lake. Utah.
                                      Area =     1880 sq.mi.


  Subregion  1603 -- Escalante Desert-Sevier Lake: The Escalante Desert
                     and the Sevier Lake closed basins. Nevada, Utah.
                       Area =    16200 sq.mi.

    Accounting Unit 160300 -- Escalante Desert-Sevier Lake: Nevada,
                              Utah.
                                Area =    16200 sq.mi.

      Cataloging Units  16030001 -- Upper Sevier. Utah.
                                      Area =     1180 sq.mi.
                        16030002 -- East Fork Sevier. Utah.
                                      Area =     1250 sq.mi.
                        16030003 -- Middle Sevier. Utah.
                                      Area =     1850 sq.mi.
                        16030004 -- San Pitch. Utah.
                                      Area =      858 sq.mi.
                        16030005 -- Lower Sevier. Utah.
                                      Area =     3970 sq.mi.
                        16030006 -- Escalante Desert. Nevada,
                                    Utah.
                                      Area =     3270 sq.mi.
                        16030007 -- Beaver Bottoms-Upper Beaver. Utah.
                                      Area =     1720 sq.mi.
                        16030008 -- Lower Beaver. Utah.
                                      Area =      746 sq.mi.
                        16030009 -- Sevier Lake. Utah.
                                      Area =     1330 sq.mi.


  Subregion  1604 -- Black Rock Desert-Humboldt: The Humboldt River
                     Basin, the Black Rock Desert, and other closed
                     basins that discharge into
                     Northwestern Nevada. California, Nevada, Oregon.
                       Area =    28300 sq.mi.

    Accounting Unit 160401 -- Humboldt: The Humboldt River Basin.
                              Nevada.
                                Area =    16700 sq.mi.

      Cataloging Units  16040101 -- Upper Humboldt. Nevada.
                                      Area =     2720 sq.mi.
                        16040102 -- North Fork Humboldt. Nevada.
                                      Area =      988 sq.mi.
                        16040103 -- South Fork Humboldt. Nevada.
                                      Area =     1270 sq.mi.
                        16040104 -- Pine. Nevada.
                                      Area =      985 sq.mi.
                        16040105 -- Middle Humboldt. Nevada.
                                      Area =     3180 sq.mi.
                        16040106 -- Rock. Nevada.
                                      Area =      888 sq.mi.
                        16040107 -- Reese. Nevada.
                                      Area =     2310 sq.mi.
                        16040108 -- Lower Humboldt. Nevada.
                                      Area =     2590 sq.mi.
                        16040109 -- Little Humboldt. Nevada.
                                      Area =     1740 sq.mi.

    Accounting Unit 160402 -- Black Rock Desert: The Black Rock Desert
                              and other closed basins that
                              discharge into Northwestern Nevada.
                              California, Nevada, Oregon.
                                Area =    11600 sq.mi.

      Cataloging Units  16040201 -- Upper Quinn. Nevada, Oregon.
                                      Area =     3480 sq.mi.
                        16040202 -- Lower Quinn. Nevada.
                                      Area =     3230 sq.mi.
                        16040203 -- Smoke Creek Desert. California,
                                    Nevada.
                                      Area =     2430 sq.mi.
                        16040204 -- Massacre Lake. California, Nevada,
                                      Area =     1300 sq.mi.
                        16040205 -- Thousand-Virgin. Nevada, Oregon.
                                      Area =     1150 sq.mi.


  Subregion  1605 -- Central Lahontan: The Central Lahontan Basin
                     Consisting of the Carson, Truckee, and Walker River
                     Basins. California, Nevada.
                       Area =    12500 sq.mi.

    Accounting Unit 160501 -- Truckee: The Truckee River Basin.
                              California, Nevada.
                                Area =     4710 sq.mi.

      Cataloging Units  16050101 -- Lake Tahoe. California, Nevada.
                                      Area =      505 sq.mi.
                        16050102 -- Truckee. California, Nevada.
                                      Area =     1190 sq.mi.
                        16050103 -- Pyramid-Winnemucca Lakes. Nevada.
                                      Area =     1370 sq.mi.
                        16050104 -- Granite Springs Valley. Nevada.
                                      Area =     1640 sq.mi.

    Accounting Unit 160502 -- Carson: The Carson River Basin.
                              California, Nevada.
                                Area =     3930 sq.mi.

      Cataloging Units  16050201 -- Upper Carson. California, Nevada.
                                      Area =      934 sq.mi.
                        16050202 -- Middle Carson. Nevada.
                                      Area =      843 sq.mi.
                        16050203 -- Carson Desert. Nevada.
                                      Area =     2150 sq.mi.

    Accounting Unit 160503 -- Walker: The Walker River Basin.
                              California, Nevada.
                                Area =     3920 sq.mi.

      Cataloging Units  16050301 -- East Walker. California, Nevada.
                                      Area =     1080 sq.mi.
                        16050302 -- West Walker. California, Nevada.
                                      Area =      992 sq.mi.
                        16050303 -- Walker. Nevada.
                                      Area =     1010 sq.mi.
                        16050304 -- Walker Lake. Nevada.
                                      Area =      835 sq.mi.


  Subregion  1606 -- Central Nevada Desert Basins: The Closed Desert
                     Basins that discharge into South Central Nevada.
                     California, Nevada.
                       Area =    47100 sq.mi.

    Accounting Unit 160600 -- Central Nevada Desert Basins: California,
                              Nevada.
                                Area =    47100 sq.mi.

      Cataloging Units  16060001 -- Dixie Valley. Nevada.
                                      Area =     3990 sq.mi.
                        16060002 -- Gabbs Valley. Nevada.
                                      Area =     2060 sq.mi.
                        16060003 -- Southern Big Smoky Valley. Nevada.
                                      Area =     2030 sq.mi.
                        16060004 -- Northern Big Smoky Valley. Nevada.
                                      Area =     1890 sq.mi.
                        16060005 -- Diamond-Monitor Valleys. Nevada.
                                      Area =     3070 sq.mi.
                        16060006 -- Little Smoky-Newark Valleys. Nevada.
                                      Area =     1430 sq.mi.
                        16060007 -- Long-Ruby Valleys. Nevada.
                                      Area =     4060 sq.mi.
                        16060008 -- Spring-Steptoe Valleys. Nevada.
                                      Area =     5240 sq.mi.
                        16060009 -- Dry Lake Valley. Nevada.
                                      Area =     2160 sq.mi.
                        16060010 -- Fish Lake-Soda Spring Valleys.
                                    California, Nevada.
                                      Area =     2720 sq.mi.
                        16060011 -- Ralston-Stone Cabin Valleys. Nevada.
                                      Area =     3190 sq.mi.
                        16060012 -- Hot Creek-Railroad Valleys. Nevada.
                                      Area =     4660 sq.mi.
                        16060013 -- Cactus-Sarcobatus Flats. Nevada.
                                      Area =     2720 sq.mi.
                        16060014 -- Sand Spring-Tikaboo Valleys. Nevada.
                                      Area =     5070 sq.mi.
                        16060015 -- Ivanpah-Pahrump Valleys. California,
                                    Nevada.
                                      Area =     2830 sq.mi.


Region 17  Pacific Northwest Region -- The drainage within the United
           States that ultimately discharges into: (a) the Straits of
           Georgia and of Juan De Fuca, and (b) the Pacific Ocean within
           the states of Oregon and Washington; and that part of the
           Great Basin whose discharge is into the state of Oregon.
           Includes all of Washington and parts of California,
           Idaho, Montana, Nevada, Oregon, Utah, and Wyoming.


  Subregion  1701 -- Kootenai-Pend Oreille-Spokane: The Kootenai, Pend
                     Oreille, and Spokane River Basins within the United
                     States. Idaho, Montana, and Washington.
                       Area =    36600 sq.mi.

    Accounting Unit 170101 -- Kootenai: The Kootenai River Basin within
                              the United States. Idaho, Montana.
                                Area =     4850 sq.mi.

      Cataloging Units  17010101 -- Upper Kootenai. Idaho, Montana.
                                      Area =     2290 sq.mi.
                        17010102 -- Fisher. Montana.
                                      Area =      843 sq.mi.
                        17010103 -- Yaak. Montana.
                                      Area =      630 sq.mi.
                        17010104 -- Lower Kootenai. Idaho, Montana.
                                      Area =      887 sq.mi.
                        17010105 -- Moyie. Idaho, Montana.
                                      Area =      203 sq.mi.

    Accounting Unit 170102 -- Pend Oreille: The Pend Oreille River Basin
                              within the United States. Idaho, Montana,
                              and Washington.
                                Area =    25100 sq.mi.

      Cataloging Units  17010201 -- Upper Clark Fork. Montana.
                                      Area =     2320 sq.mi.
                        17010202 -- Flint-Rock. Montana.
                                      Area =     1400 sq.mi.
                        17010203 -- Blackfoot. Montana.
                                      Area =     2340 sq.mi.
                        17010204 -- Middle Clark Fork. Montana.
                                      Area =     1970 sq.mi.
                        17010205 -- Bitterroot. Montana.
                                      Area =     2860 sq.mi.
                        17010206 -- North Fork Flathead. Montana.
                                      Area =      967 sq.mi.
                        17010207 -- Middle Fork Flathead. Montana.
                                      Area =     1160 sq.mi.
                        17010208 -- Flathead Lake. Montana.
                                      Area =     1160 sq.mi.
                        17010209 -- South Fork Flathead. Montana.
                                      Area =     1690 sq.mi.
                        17010210 -- Stillwater. Montana.
                                      Area =      830 sq.mi.
                        17010211 -- Swan. Montana.
                                      Area =      748 sq.mi.
                        17010212 -- Lower Flathead. Montana.
                                      Area =     2010 sq.mi.
                        17010213 -- Lower Clark Fork. Idaho, Montana.
                                      Area =     2330 sq.mi.
                        17010214 -- Pend Oreille Lake. Idaho, Washington.
                                      Area =     1240 sq.mi.
                        17010215 -- Priest. Idaho, Washington.
                                      Area =      983 sq.mi.
                        17010216 -- Pend Oreille. Idaho, Washington.
                                      Area =     1080 sq.mi.

    Accounting Unit 170103 -- Spokane: The Spokane River Basin. Idaho,
                              Washington.
                                Area =     6680 sq.mi.

      Cataloging Units  17010301 -- Upper Coeur D'alene. Idaho
                                      Area =      905 sq.mi.
                        17010302 -- South Fork Coeur D'alene. Idaho.
                                      Area =      297 sq.mi.
                        17010303 -- Coeur D'alene Lake. Idaho,
                                    Washington.
                                      Area =      663 sq.mi.
                        17010304 -- St. Joe. Idaho.
                                      Area =     1860 sq.mi.
                        17010305 -- Upper Spokane. Idaho, Washington.
                                      Area =      609 sq.mi.
                        17010306 -- Hangman. Idaho, Washington.
                                      Area =      714 sq.mi.
                        17010307 -- Lower Spokane. Washington.
                                      Area =      904 sq.mi.
                        17010308 -- Little Spokane. Idaho, Washington.
                                      Area =      723 sq.mi.


  Subregion  1702 -- Upper Columbia: The Columbia River Basin within the
                     the United States above the confluence with the
                     Snake River Basin, excluding the Yakima River
                     Basin. Washington.
                       Area =    22600 sq.mi.

    Accounting Unit 170200 -- Upper Columbia. Washington.
                                Area =    22600 sq.mi.

      Cataloging Units  17020001 -- Franklin D. Roosevelt Lake.
                                    Washington.
                                      Area =     2170 sq.mi.
                        17020002 -- Kettle. Washington.
                                      Area =      966 sq.mi.
                        17020003 -- Colville. Washington.
                                      Area =     1030 sq.mi.
                        17020004 -- Sanpoil. Washington.
                                      Area =     1080 sq.mi.
                        17020005 -- Chief Joseph. Washington.
                                      Area =     1390 sq.mi.
                        17020006 -- Okanogan. Washington.
                                      Area =     1640 sq.mi.
                        17020007 -- Similkameen. Washington.
                                      Area =      671 sq.mi.
                        17020008 -- Methow. Washington.
                                      Area =     1820 sq.mi.
                        17020009 -- Lake Chelan. Washington.
                                      Area =      955 sq.mi.
                        17020010 -- Upper Columbia-Entiat. Washington.
                                      Area =     1520 sq.mi.
                        17020011 -- Wenatchee. Washington.
                                      Area =     1350 sq.mi.
                        17020012 -- Moses Coulee. Washington.
                                      Area =      926 sq.mi.
                        17020013 -- Upper Crab. Washington.
                                      Area =     1860 sq.mi.
                        17020014 -- Banks Lake. Washington.
                                      Area =      609 sq.mi.
                        17020015 -- Lower Crab. Washington.
                                      Area =     2510 sq.mi.
                        17020016 -- Upper Columbia-Priest Rapids.
                                    Washington.
                                      Area =     2070 sq.mi.


  Subregion  1703 -- Yakima. The Yakima River Basin. Washington.
                       Area =     6210 sq.mi.

    Accounting Unit 170300 -- Yakima. Washington.
                                Area =     6210 sq.mi.

      Cataloging Units  17030001 -- Upper Yakima. Washington.
                                      Area =     2130 sq.mi.
                        17030002 -- Naches. Washington.
                                      Area =     1130 sq.mi.
                        17030003 -- Lower Yakima, Washington.
                                      Area =     2950 sq.mi.


  Subregion  1704 -- Upper Snake: The Snake River Basin to and
                     including the Clover Creek Basin.
                     Idaho, Nevada, Utah, Wyoming.
                       Area =    35600 sq.mi.

    Accounting Unit 170401 -- Snake headwaters: The Snake River Basin
                              above Kelly Mountain. Idaho, Wyoming.
                                Area =     5690 sq.mi.

      Cataloging Units  17040101 -- Snake headwaters. Wyoming.
                                      Area =     1680 sq.mi.
                        17040102 -- Gros Ventre. Wyoming.
                                      Area =      638 sq.mi.
                        17040103 -- Greys-Hobock. Wyoming.
                                      Area =     1570 sq.mi.
                        17040104 -- Palisades. Idaho, Wyoming.
                                      Area =      915 sq.mi.
                        17040105 -- Salt. Idaho, Wyoming.
                                      Area =      887 sq.mi.

    Accounting Unit 170402 -- Upper Snake: The Snake River Basin from
                              Kelly Mountain to and including the
                              Clover Creek Basin. Idaho, Nevada,
                              Utah, Wyoming.
                                Area =    29900 sq.mi.

      Cataloging Units  17040201 -- Idaho Falls. Idaho.
                                      Area =     1140 sq.mi.
                        17040202 -- Upper Henrys. Idaho, Wyoming.
                                      Area =     1090 sq.mi.
                        17040203 -- Lower Henrys. Idaho, Wyoming.
                                      Area =     1040 sq.mi.
                        17040204 -- Teton. Idaho, Wyoming.
                                      Area =     1130 sq.mi.
                        17040205 -- Willow. Idaho.
                                      Area =      645 sq.mi.
                        17040206 -- American Falls. Idaho.
                                      Area =     2850 sq.mi.
                        17040207 -- Blackfoot. Idaho.
                                      Area =     1080 sq.mi.
                        17040208 -- Portneuf. Idaho.
                                      Area =     1320 sq.mi.
                        17040209 -- Lake Walcott. Idaho.
                                      Area =     3670 sq.mi.
                        17040210 -- Raft. Idaho, Utah.
                                      Area =     1470 sq.mi.
                        17040211 -- Goose. Idaho, Nevada, Utah.
                                      Area =     1150 sq.mi.
                        17040212 -- Upper Snake-Rock. Idaho.
                                      Area =     2440 sq.mi.
                        17040213 -- Salmon Falls. Idaho, Nevada.
                                      Area =     2120 sq.mi.
                        17040214 -- Beaver-Camas. Idaho.
                                      Area =      982 sq.mi.
                        17040215 -- Medicine Lodge. Idaho.
                                      Area =      952 sq.mi.
                        17040216 -- Birch. Idaho.
                                      Area =      692 sq.mi.
                        17040217 -- Little Lost. Idaho.
                                      Area =      957 sq.mi.
                        17040218 -- Big Lost. Idaho.
                                      Area =     1900 sq.mi.
                        17040219 -- Big Wood. Idaho.
                                      Area =     1460 sq.mi.
                        17040220 -- Camas. Idaho.
                                      Area =      672 sq.mi.
                        17040221 -- Little Wood. Idaho.
                                      Area =     1120 sq.mi.


  Subregion  1705 -- Middle Snake: The Snake River Basin below the Clover
                     Creek Basin to Hells Canyon Dam. Idaho,
                     Nevada, Oregon.
                       Area =    36700 sq.mi.

    Accounting Unit 170501 -- Middle Snake-Boise: The Snake River Basin
                              below the Clover Creek Basin to and
                              including the Weiser River Basin.
                              Idaho, Nevada, Oregon.
                                Area =    32600 sq.mi.

      Cataloging Units  17050101 -- C. J. Strike Reservoir. Idaho.
                                      Area =     2150 sq.mi.
                        17050102 -- Bruneau. Idaho, Nevada.
                                      Area =     3290 sq.mi.
                        17050103 -- Middle Snake-Succor. Idaho, Oregon.
                                      Area =     2280 sq.mi.
                        17050104 -- Upper Owyhee. Idaho, Nevada.
                                      Area =     2110 sq.mi.
                        17050105 -- South Fork Owyhee. Idaho, Nevada,
                                    Oregon.
                                      Area =     1860 sq.mi.
                        17050106 -- East Little Owyhee. Idaho. Nevada,
                                    Oregon.
                                      Area =      910 sq.mi.
                        17050107 -- Middle Owyhee. Idaho, Nevada,
                                    Oregon.
                                      Area =     1460 sq.mi.
                        17050108 -- Jordan. Idaho, Oregon.
                                      Area =     1270 sq.mi.
                        17050109 -- Crooked-Rattlesnake. Oregon.
                                      Area =     1340 sq.mi.
                        17050110 -- Lower Owyhee. Oregon.
                                      Area =     2000 sq.mi.
                        17050111 -- North and Middle Forks Boise. Idaho.
                                      Area =      761 sq.mi.
                        17050112 -- Boise-Mores. Idaho.
                                      Area =      620 sq.mi.
                        17050113 -- South Fork Boise. Idaho.
                                      Area =     1300 sq.mi.
                        17050114 -- Lower Boise. Idaho.
                                      Area =     1330 sq.mi.
                        17050115 -- Middle Snake-Payette. Idaho,
                                    Oregon.
                                      Area =      294 sq.mi.
                        17050116 -- Upper Malheur. Oregon.
                                      Area =     2430 sq.mi.
                        17050117 -- Lower Malheur. Oregon.
                                      Area =      927 sq.mi.
                        17050118 -- Bully. Oregon.
                                      Area =      577 sq.mi.
                        17050119 -- Willow. Oregon.
                                      Area =      773 sq.mi.
                        17050120 -- South Fork Payette. Idaho.
                                      Area =      813 sq.mi.
                        17050121 -- Middle Fork Payette. Idaho.
                                      Area =      338 sq.mi.
                        17050122 -- Payette. Idaho.
                                      Area =     1240 sq.mi.
                        17050123 -- North Fork Payette. Idaho.
                                      Area =      912 sq.mi.
                        17050124 -- Weiser. Idaho.
                                      Area =     1660 sq.mi.

    Accounting Unit 170502 -- Middle Snake-Powder: The Snake River Basin
                              below the Weiser River Basin
                              to Hells Canyon Dam. Idaho, Oregon.
                                Area =     4100 sq.mi.

      Cataloging Units  17050201 -- Brownlee Reservoir. Idaho, Oregon.
                                      Area =     1290 sq.mi.
                        17050202 -- Burnt. Oregon.
                                      Area =     1090 sq.mi.
                        17050203 -- Powder. Oregon.
                                      Area =     1720 sq.mi.


  Subregion  1706 -- Lower Snake: The Snake River Basin below Hells
                     Canyon Dam to its confluence with the Columbia
                     River. Idaho, Oregon, Washington.
                       Area =    35200 sq.mi.

    Accounting Unit 170601 -- Lower Snake: The Snake River Basin below
                              Hells Canyon Dam to its confluence with
                              the Columbia River, excluding the Salmon
                              and Clearwater River Basins. Idaho,
                              Oregon, Washington.
                                Area =    11800 sq.mi.

      Cataloging Units  17060101 -- Hells Canyon. Idaho, Oregon.
                                      Area =      545 sq.mi.
                        17060102 -- Imnaha. Oregon.
                                      Area =      855 sq.mi.
                        17060103 -- Lower Snake-Asotin. Idaho, Oregon,
                                    Washington.
                                      Area =      711 sq.mi.
                        17060104 -- Upper Grande Ronde. Oregon.
                                      Area =     1650 sq.mi.
                        17060105 -- Wallowa. Oregon.
                                      Area =      950 sq.mi.
                        17060106 -- Lower Grande Ronde. Oregon,
                                    Washington.
                                      Area =     1530 sq.mi.
                        17060107 -- Lower Snake-Tucannon. Washington.
                                      Area =     1480 sq.mi.
                        17060108 -- Palouse. Idaho, Washington.
                                      Area =     2360 sq.mi.
                        17060109 -- Rock. Idaho, Washington.
                                      Area =      962 sq.mi.
                        17060110 -- Lower Snake. Washington.
                                      Area =      731 sq.mi.

    Accounting Unit 170602 -- Salmon: The Salmon River Basin. Idaho.
                                Area =    14000 sq.mi.

      Cataloging Units  17060201 -- Upper Salmon. Idaho.
                                      Area =     2410 sq.mi.
                        17060202 -- Pahsimeroi. Idaho.
                                      Area =      825 sq.mi.
                        17060203 -- Middle Salmon-Panther. Idaho.
                                      Area =     1810 sq.mi.
                        17060204 -- Lemhi. Idaho.
                                      Area =     1270 sq.mi.
                        17060205 -- Upper Middle Fork Salmon. Idaho.
                                      Area =     1490 sq.mi.
                        17060206 -- Lower Middle Fork Salmon. Idaho.
                                      Area =     1370 sq.mi.
                        17060207 -- Middle Salmon-Chamberlain. Idaho.
                                      Area =     1700 sq.mi.
                        17060208 -- South Fork Salmon. Idaho.
                                      Area =     1310 sq.mi.
                        17060209 -- Lower Salmon. Idaho.
                                      Area =     1240 sq.mi.
                        17060210 -- Little Salmon. Idaho.
                                      Area =      582 sq.mi.

    Accounting Unit 170603 -- Clearwater: The Clearwater River Basin.
                              Idaho, Washington.
                                Area =     9420 sq.mi.

      Cataloging Units  17060301 -- Upper Selway. Idaho.
                                      Area =      997 sq.mi.
                        17060302 -- Lower Selway. Idaho.
                                      Area =     1030 sq.mi.
                        17060303 -- Lochsa. Idaho.
                                      Area =     1180 sq.mi.
                        17060304 -- Middle Fork Clearwater. Idaho.
                                      Area =      213 sq.mi.
                        17060305 -- South Fork Clearwater. Idaho.
                                      Area =     1170 sq.mi.
                        17060306 -- Clearwater. Idaho, Washington.
                                      Area =     2340 sq.mi.
                        17060307 -- Upper North Fork Clearwater. Idaho.
                                      Area =     1320 sq.mi.
                        17060308 -- Lower North Fork Clearwater. Idaho.
                                      Area =     1170 sq.mi.


  Subregion  1707 -- Middle Columbia: The Columbia River Basin below the
                     confluence with the Snake River Basin to Bonneville
                     Dam. Oregon, Washington.
                       Area =    29800 sq.mi.

    Accounting Unit 170701 -- Middle Columbia: The Columbia River Basin
                              below the confluence with the Snake River
                              Basin to Bonneville Dam, excluding the
                              Deschutes and John Day River Basins.
                              Oregon, Washington.
                                Area =    11200 sq.mi.

      Cataloging Units  17070101 -- Middle Columbia-Lake Wallula.
                                    Oregon, Washington.
                                      Area =     2550 sq.mi.
                        17070102 -- Walla Walla. Oregon, Washington.
                                      Area =     1750 sq.mi.
                        17070103 -- Umatilla. Oregon.
                                      Area =     2540 sq.mi.
                        17070104 -- Willow. Oregon.
                                      Area =      881 sq.mi.
                        17070105 -- Middle Columbia-Hood. Oregon,
                                    Washington.
                                      Area =     2170 sq.mi.
                        17070106 -- Klickitat. Washington.
                                      Area =     1330 sq.mi.

    Accounting Unit 170702 -- John Day: The John Day River Basin.
                              Oregon.
                                Area =     7910 sq.mi.

      Cataloging Units  17070201 -- Upper John Day. Oregon.
                                      Area =     2130 sq.mi.
                        17070202 -- North Fork John Day. Oregon.
                                      Area =     1830 sq.mi.
                        17070203 -- Middle Fork John Day. Oregon.
                                      Area =      785 sq.mi.
                        17070204 -- Lower John Day. Oregon.
                                      Area =     3160 sq.mi.

    Accounting Unit 170703 -- Deschutes: The Deschutes River Basin.
                              Oregon.
                                Area =    10700 sq.mi.

      Cataloging Units  17070301 -- Upper Deschutes. Oregon.
                                      Area =     2140 sq.mi.
                        17070302 -- Little Deschutes. Oregon.
                                      Area =     1020 sq.mi.
                        17070303 -- Beaver-South Fork. Oregon.
                                      Area =     1530 sq.mi.
                        17070304 -- Upper Crooked. Oregon.
                                      Area =     1150 sq.mi.
                        17070305 -- Lower Crooked. Oregon.
                                      Area =     1840 sq.mi.
                        17070306 -- Lower Deschutes. Oregon.
                                      Area =     2300 sq.mi.
                        17070307 -- Trout. Oregon.
                                      Area =      695 sq.mi.


  Subregion  1708 -- Lower Columbia: The Columbia River Basin below
                     Bonneville Dam, excluding the Willamette River
                     Basin. Oregon, Washington.
                       Area =     6250 sq.mi.

    Accounting Unit 170800 -- Lower Columbia. Oregon, Washington.
                                Area =     6250 sq.mi.

      Cataloging Units  17080001 -- Lower Columbia-Sandy. Oregon,
                                    Washington.
                                      Area =     1110 sq.mi.
                        17080002 -- Lewis. Washington.
                                      Area =     1080 sq.mi.
                        17080003 -- Lower Columbia-Clatskanie. Oregon,
                                    Washington.
                                      Area =      896 sq.mi.
                        17080004 -- Upper Cowlitz. Washington.
                                      Area =     1030 sq.mi.
                        17080005 -- Lower Cowlitz. Washington.
                                      Area =     1460 sq.mi.
                        17080006 -- Lower Columbia. Oregon, Washington.
                                      Area =      672 sq.mi.


  Subregion  1709 -- Willamette: The Willamette River Basin. Oregon.
                       Area =    11400 sq.mi.

    Accounting Unit 170900 -- Willamette. Oregon.
                                Area =    11400 sq.mi.

      Cataloging Units  17090001 -- Middle Fork Willamette. Oregon.
                                      Area =     1350 sq.mi.
                        17090002 -- Coast Fork Willamette. Oregon.
                                      Area =      664 sq.mi.
                        17090003 -- Upper Willamette. Oregon.
                                      Area =     1830 sq.mi.
                        17090004 -- Mckenzie. Oregon.
                                      Area =     1360 sq.mi.
                        17090005 -- North Santiam. Oregon.
                                      Area =      771 sq.mi.
                        17090006 -- South Santiam. Oregon.
                                      Area =     1050 sq.mi.
                        17090007 -- Middle Willamette. Oregon.
                                      Area =      700 sq.mi.
                        17090008 -- Yamhill. Oregon.
                                      Area =      770 sq.mi.
                        17090009 -- Molalla-Pudding. Oregon.
                                      Area =      883 sq.mi.
                        17090010 -- Tualatin. Oregon.
                                      Area =      718 sq.mi.
                        17090011 -- Clackamas. Oregon.
                                      Area =      935 sq.mi.
                        17090012 -- Lower Willamette. Oregon.
                                      Area =      407 sq.mi.


  Subregion  1710 -- Oregon-Washington Coastal: The drainage into the
                     drainage boundary to the Smith River Basin boundary,
                     excluding the Columbia River Basin. California,
                     Oregon, Washington.
                       Area =    23200 sq.mi.

    Accounting Unit 171001 -- Washington Coastal: The drainage into the
                              Pacific Ocean from the Strait of Juan De
                              Fuca drainage boundary to the Columbia
                              River Basin boundary. Washington.
                                Area =    6240 sq.mi.

      Cataloging Units  17100101 -- Hoh-Quillayute. Washington.
                                      Area =     1230 sq.mi.
                        17100102 -- Queets-Quinault. Washington.
                                      Area =     1190 sq.mi.
                        17100103 -- Upper Chehalis. Washington.
                                      Area =     1310 sq.mi.
                        17100104 -- Lower Chehalis. Washington.
                                      Area =      838 sq.mi.
                        17100105 -- Grays Harbor. Washington.
                                      Area =      568 sq.mi.
                        17100106 -- Willapa Bay. Washington.
                                      Area =     1100 sq.mi.

    Accounting Unit 171002 -- Northern Oregon Coastal: The drainage into
                              the Pacific Ocean from the Columbia River
                              Basin boundary to the Umpqua River Basin
                              boundary. Oregon.
                                Area =     4310 sq.mi.

      Cataloging Units  17100201 -- Necanicum. Oregon.
                                      Area =      129 sq.mi.
                        17100202 -- Nehalem. Oregon.
                                      Area =      860 sq.mi.
                        17100203 -- Wilson-Trusk-Nestuccu. Oregon.
                                      Area =      973 sq.mi.
                        17100204 -- Siletz-Yaquina. Oregon.
                                      Area =      753 sq.mi.
                        17100205 -- Alsea. Oregon.
                                      Area =      697 sq.mi.
                        17100206 -- Siuslaw. Oregon.
                                      Area =      769 sq.mi.
                        17100207 -- Siltcoos. Oregon.
                                      Area =      129 sq.mi.

    Accounting Unit 171003 -- Southern Oregon Coastal: The drainage into
                              the Pacific Ocean from and including the
                              Umpqua River Basin to the Smith River
                              Basin boundary. California, Oregon.
                                Area =    12600 sq.mi.

      Cataloging Units  17100301 -- North Umpqua. Oregon.
                                      Area =     1350 sq.mi.
                        17100302 -- South Umpqua. Oregon.
                                      Area =     1790 sq.mi.
                        17100303 -- Umpqua. Oregon.
                                      Area =     1500 sq.mi.
                        17100304 -- Coos. Oregon.
                                      Area =      739 sq.mi.
                        17100305 -- Coquille. Oregon.
                                      Area =     1030 sq.mi.
                        17100306 -- Sixes. Oregon.
                                      Area =      467 sq.mi.
                        17100307 -- Upper Rogue. Oregon.
                                      Area =     1610 sq.mi.
                        17100308 -- Middle Rogue. Oregon.
                                      Area =      885 sq.mi.
                        17100309 -- Applegate. California, Oregon.
                                      Area =      759 sq.mi.
                        17100310 -- Lower Rogue. Oregon.
                                      Area =      898 sq.mi.
                        17100311 -- Illinois. California, Oregon.
                                      Area =      981 sq.mi.
                        17100312 -- Chetco. California, Oregon.
                                      Area =      630 sq.mi.


  Subregion  1711 -- Puget Sound: The drainage within the United States
                     that discharges into: (a) Puget Sound and the
                     Straits of Georgia and of Juan De Fuca; and (b) the
                     Fraser River Basin. Washington.
                       Area =    16800 sq.mi.

    Accounting Unit 171100 -- Puget Sound. Washington.
                                Area =    16800 sq.mi.

      Cataloging Units  17110001 -- Fraser. Washington.
                                      Area =      249 sq.mi.
                        17110002 -- Strait of Georgia. Washington.
                                      Area =      955 sq.mi.
                        17110003 -- San Juan Islands. Washington.
                                      Area =      626 sq.mi.
                        17110004 -- Nooksack. Washington.
                                      Area =      795 sq.mi.
                        17110005 -- Upper Skagit. Washington.
                                      Area =     1630 sq.mi.
                        17110006 -- Sauk. Washington.
                                      Area =      741 sq.mi.
                        17110007 -- Lower Skagit. Washington.
                                      Area =      447 sq.mi.
                        17110008 -- Stillaguamish. Washington.
                                      Area =      704 sq.mi.
                        17110009 -- Skykomish. Washington.
                                      Area =      853 sq.mi.
                        17110010 -- Snoqualmie. Washington.
                                      Area =      693 sq.mi.
                        17110011 -- Snohomish. Washington.
                                      Area =      278 sq.mi.
                        17110012 -- Lake Washington. Washington.
                                      Area =      619 sq.mi.
                        17110013 -- Duwamish. Washington.
                                      Area =      487 sq.mi.
                        17110014 -- Puyallup. Washington.
                                      Area =      996 sq.mi.
                        17110015 -- Nisqually. Washington.
                                      Area =      726 sq.mi.
                        17110016 -- Deschutes. Washington.
                                      Area =      168 sq.mi.
                        17110017 -- Skokomish. Washington.
                                      Area =      248 sq.mi.
                        17110018 -- Hood Canal. Washington.
                                      Area =      957 sq.mi.
                        17110019 -- Puget Sound. Washington.
                                      Area =     2550 sq.mi.
                        17110020 -- Dungeness-Elwha. Washington.
                                      Area =     1270 sq.mi.
                        17110021 -- Crescent-Hoko. Washington.
                                      Area =      774 sq.mi.


  Subregion  1712 -- Oregon closed basins: The drainage of the Great
                     Basin that discharges into the state
                     of Oregon. California, Nevada, Oregon.
                       Area =    17300 sq.mi.

    Accounting Unit 171200 -- Oregon closed basins. California,
                              Nevada, Oregon.
                                Area =    17300 sq.mi.

      Cataloging Units  17120001 -- Harney-Malheur Lakes. Oregon.
                                      Area =     1420 sq.mi.
                        17120002 -- Silvies. Oregon.
                                      Area =     1310 sq.mi.
                        17120003 -- Donner Und Blitzen. Oregon.
                                      Area =      765 sq.mi.
                        17120004 -- Silver. Oregon.
                                      Area =     1670 sq.mi.
                        17120005 -- Summer Lake. Oregon.
                                      Area =     4100 sq.mi.
                        17120006 -- Lake Abert. Oregon.
                                      Area =     1020 sq.mi.
                        17120007 -- Warner Lakes. California, Nevada,
                                    Oregon.
                                      Area =     1900 sq.mi.
                        17120008 -- Guano. Nevada, Oregon.
                                      Area =     2970 sq.mi.
                        17120009 -- Alvord Lake. Nevada, Oregon.
                                      Area =     2110 sq.mi.


Region 18  California Region -- (a) the drainage within the United States
           that ultimately discharges into the Pacific Ocean within
           the state of California; and (b) those parts of the Great Basin
           (or other closed basins) that discharge into the state of
           California. Includes parts of California, Nevada, and Oregon.


  Subregion  1801 -- Klamath-Northern California Coastal: The drainage
                     into the Pacific Ocean from and including the Smith
                     River Basin to and including the Stemple
                     Creek Basin. California, Oregon.
                       Area =    24800 sq.mi.

    Accounting Unit 180101 -- Northern California Coastal: The drainage
                              into the Pacific Ocean from and including
                              the Smith River Basin to and including
                              the Stemple Creek Basin, excluding the
                              Klamath River Basin. California, Oregon.
                                Area =     9230 sq.mi.

      Cataloging Units  18010101 -- Smith. California, Oregon.
                                      Area =      788 sq.mi.
                        18010102 -- Mad-Redwood. California.
                                      Area =     1130 sq.mi.
                        18010103 -- Upper Eel. California.
                                      Area =      697 sq.mi.
                        18010104 -- Middle Fork Eel. California.
                                      Area =      747 sq.mi.
                        18010105 -- Lower Eel. California.
                                      Area =     1510 sq.mi.
                        18010106 -- South Fork Eel. California.
                                      Area =      678 sq.mi.
                        18010107 -- Mattole. California.
                                      Area =      485 sq.mi.
                        18010108 -- Big-Navarro-Garcia. California.
                                      Area =     1230 sq.mi.
                        18010109 -- Gualala-Salmon. California.
                                      Area =      343 sq.mi.
                        18010110 -- Russian. California.
                                      Area =     1470 sq.mi.
                        18010111 -- Bodega Bay. California.
                                      Area =      147 sq.mi.

    Accounting Unit 180102 -- Klamath. The Klamath River Basin.
                              California, Oregon.
                                Area =    15500 sq.mi.

      Cataloging Units  18010201 -- Williamson. Oregon.
                                      Area =     1430 sq.mi.
                        18010202 -- Sprague. Oregon.
                                      Area =     1600 sq.mi.
                        18010203 -- Upper Klamath Lake. Oregon.
                                      Area =      738 sq.mi.
                        18010204 -- Lost. California, Oregon.
                                      Area =     2960 sq.mi.
                        18010205 -- Butte. California, Oregon.
                                      Area =      601 sq.mi.
                        18010206 -- Upper Klamath. California, Oregon.
                                      Area =     1400 sq.mi.
                        18010207 -- Shasta. California.
                                      Area =      791 sq.mi.
                        18010208 -- Scott. California.
                                      Area =      802 sq.mi.
                        18010209 -- Lower Klamath. California, Oregon.
                                      Area =     1520 sq.mi.
                        18010210 -- Salmon. California.
                                      Area =      748 sq.mi.
                        18010211 -- Trinity. California.
                                      Area =     2010 sq.mi.
                        18010212 -- South Fork Trinity. California.
                                      Area =      926 sq.mi.


  Subregion  1802 -- Sacramento: The Sacramento River Basin and drainage
                     into Goose Lake. California, Oregon.
                       Area =    27600 sq.mi.

    Accounting Unit 180200 -- Upper Sacramento: The Sacramento River
                              Basin to and including Shasta Lake and
                              drainage into Goose Lake. California,
                              Oregon.
                                Area =     7650 sq.mi.

      Cataloging Units  18020001 -- Goose Lake. California, Oregon.
                                      Area =     1080 sq.mi.
                        18020002 -- Upper Pit. California.
                                      Area =     2620 sq.mi.
                        18020003 -- Lower Pit. California.
                                      Area =     2690 sq.mi.
                        18020004 -- Mccloud. California.
                                      Area =      674 sq.mi.
                        18020005 -- Sacramento headwaters. California.
                                      Area =      587 sq.mi.

    Accounting Unit 180201 -- Lower Sacramento: The Sacramento River
                              Basin below Shasta Dam. California.
                                Area =    19900 sq.mi.

      Cataloging Units  18020101 -- Sacramento-Lower Cow-Lower Clear.
                                    California.
                                      Area =      419 sq.mi.
                        18020102 -- Lower Cottonwood. California.
                                      Area =      328 sq.mi.
                        18020103 -- Sacramento-Lower Thomes.
                                    California.
                                      Area =     1120 sq.mi.
                        18020104 -- Sacramento-Stone Corral. California.
                                      Area =     1850 sq.mi.
                        18020105 -- Lower Butte. California.
                                      Area =      593 sq.mi.
                        18020106 -- Lower Feather. California.
                                      Area =      681 sq.mi.
                        18020107 -- Lower Yuba. California.
                                      Area =       34 sq.mi.
                        18020108 -- Lower Bear. California.
                                      Area =      100 sq.mi.
                        18020109 -- Lower Sacramento. California.
                                      Area =     1720 sq.mi.
                        18020110 -- Lower Cache. California.
                                      Area =      190 sq.mi.
                        18020111 -- Lower American. California.
                                      Area =      299 sq.mi.
                        18020112 -- Sacramento-Upper Clear. California.
                                      Area =      269 sq.mi.
                        18020113 -- Cottonwood headwaters. California.
                                      Area =      602 sq.mi.
                        18020114 -- Upper Elder-Upper Thomes.
                                    California.
                                      Area =      328 sq.mi.
                        18020115 -- Upper Stony. California.
                                      Area =      731 sq.mi.
                        18020116 -- Upper Cache. California.
                                      Area =      939 sq.mi.
                        18020117 -- Upper Putah. California.
                                      Area =      558 sq.mi.
                        18020118 -- Upper Cow-Battle. California.
                                      Area =      832 sq.mi.
                        18020119 -- Mill-Big Chico. California.
                                      Area =      896 sq.mi.
                        18020120 -- Upper Butte. California.
                                      Area =      202 sq.mi.
                        18020121 -- North Fork Feather. California.
                                      Area =     1190 sq.mi.
                        18020122 -- East Branch North Fork Feather.
                                    California.
                                      Area =     1010 sq.mi.
                        18020123 -- Middle Fork Feather. California.
                                      Area =     1350 sq.mi.
                        18020124 -- Honcut headwaters. California.
                                      Area =      107 sq.mi.
                        18020125 -- Upper Yuba. California.
                                      Area =     1290 sq.mi.
                        18020126 -- Upper Bear. California.
                                      Area =      361 sq.mi.
                        18020127 -- Upper Coon-Upper Auburn. California.
                                      Area =       89 sq.mi.
                        18020128 -- North Fork American. California.
                                      Area =      998 sq.mi.
                        18020129 -- South Fork American. California.
                                      Area =      843 sq.mi.


  Subregion  1803 -- Tulare-Buena Vista Lakes: The drainage into the
                     Tulare and Buena Vista Lake closed basins.
                     California.
                       Area =    16200 sq.mi.

    Accounting Unit 180300 -- Tulare-Buena Vista Lakes. California.
                                Area =    16200 sq.mi.

      Cataloging Units  18030001 -- Upper Kern. California.
                                      Area =     1070 sq.mi.
                        18030002 -- South Fork Kern. California.
                                      Area =      964 sq.mi.
                        18030003 -- Middle Kern-Upper Tehachapi-
                                    Grapevine. California.
                                      Area =     1310 sq.mi.
                        18030004 -- Upper Poso. California.
                                      Area =      268 sq.mi.
                        18030005 -- Upper Deer-Upper White. California.
                                      Area =      345 sq.mi.
                        18030006 -- Upper Tule. California.
                                      Area =      410 sq.mi.
                        18030007 -- Upper Kaweah. California.
                                      Area =      828 sq.mi.
                        18030008 -- Mill. California.
                                      Area =      156 sq.mi.
                        18030009 -- Upper Dry. California.
                                      Area =      124 sq.mi.
                        18030010 -- Upper King. California.
                                      Area =     1520 sq.mi.
                        18030011 -- Upper Los Gatos-Avenal. California.
                                      Area =      702 sq.mi.
                        18030012 -- Tulare-Buena Vista Lakes.
                                    California.
                                      Area =     8510 sq.mi.


  Subregion  1804 -- San Joaquin: The San Joaquin River Basin.
                     California.
                        Area =   15600 sq.mi.

    Accounting Unit 180400 -- San Joaquin. California.
                                Area =    15600 sq.mi.

      Cataloging Units  18040001 -- Middle San Joaquin-Lower
                                    Chowchilla. California.
                                      Area =     2640 sq.mi.
                        18040002 -- Middle San Joaquin-Lower
                                    Merced-Lower Stanislaus. California.
                                      Area =     1830 sq.mi.
                        18040003 -- San Joaquin Delta. California.
                                      Area =      938 sq.mi.
                        18040004 -- Lower Calaveras-Mormon Slough.
                                    California.
                                      Area =      235 sq.mi.
                        18040005 -- Lower Cosumnes-Lower Mokelumne.
                                    California.
                                      Area =      747 sq.mi.
                        18040006 -- Upper San Joaquin. California.
                                      Area =     1680 sq.mi.
                        18040007 -- Upper Chowchilla-Upper Fresno.
                                    California.
                                      Area =      938 sq.mi.
                        18040008 -- Upper Merced. California.
                                      Area =     1080 sq.mi.
                        18040009 -- Upper Tuolumne. California.
                                      Area =     1600 sq.mi.
                        18040010 -- Upper Stanislaus. California.
                                      Area =      971 sq.mi.
                        18040011 -- Upper Calaveras. California.
                                      Area =      383 sq.mi.
                        18040012 -- Upper Mokelumne. California.
                                      Area =      764 sq.mi.
                        18040013 -- Upper Cosumnes. California.
                                      Area =      632 sq.mi.
                        18040014 -- Panoche-San Luis Reservoir.
                                    California.
                                      Area =     1120 sq.mi.


  Subregion  1805 -- San Francisco Bay: The drainage into the Pacific
                     Ocean from the Stemple Creek Basin boundary
                     to and including the Pescadero Creek Basin,
                     excluding the Sacramento and San Joaquin River
                     Basins. California.
                       Area =     4470 sq.mi.

    Accounting Unit 180500 -- San Francisco Bay. California.
                                Area =     4470 sq.mi.

      Cataloging Units  18050001 -- Suisun Bay. California.
                                      Area =      644 sq.mi.
                        18050002 -- San Pablo Bay. California.
                                      Area =     1200 sq.mi.
                        18050003 -- Coyote. California.
                                      Area =      831 sq.mi.
                        18050004 -- San Francisco Bay. California.
                                      Area =     1200 sq.mi.
                        18050005 -- Tomales-Drake Bays. California.
                                      Area =      339 sq.mi.
                        18050006 -- San Francisco Coastal South.
                                    California.
                                      Area =      256 sq.mi.


  Subregion  1806 -- Central California Coastal: The drainage into the
                     Pacific Ocean from the Pescadero Creek Basin
                     boundary to and including the Rincon Creek Basin.
                     California.
                       Area =    11400 sq.mi.

    Accounting Unit 180600 -- Central California Coastal.
                              California.
                                Area =    11400 sq.mi.

      Cataloging Units  18060001 -- San Lorenzo-Soquel. California.
                                      Area =      374 sq.mi.
                        18060002 -- Pajaro. California.
                                      Area =     1290 sq.mi.
                        18060003 -- Carrizo Plain. California.
                                      Area =      440 sq.mi.
                        18060004 -- Estrella. California.
                                      Area =      930 sq.mi.
                        18060005 -- Salinas. California.
                                      Area =     3250 sq.mi.
                        18060006 -- Central Coastal. California.
                                      Area =     1070 sq.mi.
                        18060007 -- Cuyama. California.
                                      Area =     1130 sq.mi.
                        18060008 -- Santa Maria. California.
                                      Area =      675 sq.mi.
                        18060009 -- San Antonio. California.
                                      Area =      219 sq.mi.
                        18060010 -- Santa Ynez. California.
                                      Area =      893 sq.mi.
                        18060011 -- Alisal-Elkhorn Sloughs. California.
                                      Area =      232 sq.mi.
                        18060012 -- Carmel. California.
                                      Area =      305 sq.mi.
                        18060013 -- Santa Barbara Coastal. California.
                                      Area =      381 sq.mi.
                        18060014 -- Santa Barbara Channel Islands.
                                    California.
                                      Area =      187 sq.mi.


  Subregion  1807 -- Southern California Coastal: The drainage within
                     the United States that discharges into
                     the Pacific Ocean from the Rincon Creek Basin
                     boundary to the California-Baja California
                     international boundary. California.
                       Area =    11100 sq.mi.

    Accounting Unit 180701 -- Ventura-San Gabriel Coastal: The drainage
                              into the Pacific Ocean from the Rincon
                              Creek Basin boundary to and including the
                              San Grabriel River Basin. California.
                                Area =     4530 sq.mi.

      Cataloging Units  18070101 -- Ventura. California.
                                      Area =      279 sq.mi.
                        18070102 -- Santa Clara. California.
                                      Area =     1610 sq.mi.
                        18070103 -- Calleguas. California.
                                      Area =      377 sq.mi.
                        18070104 -- Santa Monica Bay. California.
                                      Area =      575 sq.mi.
                        18070105 -- Los Angeles. California.
                                      Area =      819 sq.mi.
                        18070106 -- San Gabriel. California.
                                      Area =      713 sq.mi.
                        18070107 -- San Pedro Channel Islands.
                                    California.
                                      Area =      154 sq.mi.

    Accounting Unit 180702 -- Santa Ana: The drainage into the Pacific
                              Ocean from the San Gabriel River Basin
                              boundary to the Moro Canyon drainage
                              boundary Near Laguna Beach. California.
                                Area =     2680 sq.mi.

      Cataloging Units  18070201 -- Seal Beach. California.
                                      Area =       90 sq.mi.
                        18070202 -- San Jacinto. California.
                                      Area =      757 sq.mi.
                        18070203 -- Santa Ana. California.
                                      Area =     1680 sq.mi.
                        18070204 -- Newport Bay. California.
                                      Area =      154 sq.mi.

    Accounting Unit 180703 -- Laguna-San Diego Coastal: The drainage
                              within the United States that discharges
                              into the Pacific Ocean from and
                              including the Moro Canyon drainage basin
                              near Laguna Beach to the California-Baja
                              California international boundary.
                              California.
                                Area =     3860 sq.mi.

      Cataloging Units  18070301 -- Aliso-San Onofre. California.
                                      Area =      498 sq.mi.
                        18070302 -- Santa Margarita. California.
                                      Area =      731 sq.mi.
                        18070303 -- San Luis Rey-Escondido. California.
                                      Area =      766 sq.mi.
                        18070304 -- San Diego. California.
                                      Area =     1390 sq.mi.
                        18070305 -- Cottonwood-Tijuana. California.
                                      Area =      477 sq.mi.


  Subregion  1808 -- North Lahontan: The drainage east of the Sierra
                     Nevada and north of the Truckee River Basin which
                     includes the Lahonton closed basins that
                     discharge into California. California, Nevada.
                       Area =     4480 sq.mi.

    Accounting Unit 180800 -- North Lahontan. California, Nevada.
                                Area =     4480 sq.mi.

      Cataloging Units  18080001 -- Surprise Valley. California, Nevada.
                                      Area =      878 sq.mi.
                        18080002 -- Madeline Plains. California, Nevada.
                                      Area =      835 sq.mi.
                        18080003 -- Honey-Eagle Lakes. California,
                                    Nevada.
                                      Area =     2770 sq.mi.


  Subregion  1809 -- Northern Mojave-Mono Lake: The Closed Desert Basins
                     that discharge into South Central California,
                     including Mono Lake, Owens Lake, Death Valley,
                     and the Upper Mojave Desert. California, Nevada.
                       Area =    28000 sq.mi.

    Accounting Unit 180901 -- Mono-Owens Lakes. The Mono Lake and
                              Owens Lake closed basins. California,
                              Nevada.
                                Area =     4310 sq.mi.

      Cataloging Units  18090101 -- Mono Lake. California, Nevada.
                                      Area =     1070 sq.mi.
                        18090102 -- Crowley Lake. California, Nevada.
                                      Area =     1900 sq.mi.
                        18090103 -- Owens Lake. California.
                                      Area =     1340 sq.mi.

    Accounting Unit 180902 -- Northern Mojave: The Closed Desert Basins
                              that discharge into South Central
                              California, including Death Valley and the
                              Upper Mojave Desert, excluding Mono Lake and
                              Owens Lake. California, Nevada.
                                Area =    23600 sq.mi.

      Cataloging Units  18090201 -- Eureka-Saline Valleys. California,
                                    Nevada.
                                      Area =     1640 sq.mi.
                        18090202 -- Upper Amargosa. California, Nevada.
                                      Area =     3340 sq.mi.
                        18090203 -- Death Valley-Lower Amargosa.
                                    California, Nevada.
                                      Area =     5330 sq.mi.
                        18090204 -- Panamint Valley. California.
                                      Area =     1600 sq.mi.
                        18090205 -- Indian Wells-Searles Valleys.
                                    California.
                                      Area =     2020 sq.mi.
                        18090206 -- Antelope-Fremont Valleys.
                                    California.
                                      Area =     3310 sq.mi.
                        18090207 -- Coyote-Cuddeback Lakes. California.
                                      Area =     1820 sq.mi.
                        18090208 -- Mojave. California.
                                      Area =     4580 sq.mi.


  Subregion  1810 -- Southern Mojave-Salton Sea: The closed desert
                     basins in Southeastern California, including the
                     Lower Mojave Desert and the Salton Sea.
                     California.
                       Area =    16000 sq.mi.

    Accounting Unit 181001 -- Southern Mojave: The Lower Mojave Desert.
                              California.
                                Area =     8700 sq.mi.

      Cataloging Unit   18100100 -- Southern Mojave. California.
                                      Area =     8700 sq.mi.

    Accounting Unit 181002 -- Salton Sea: The Salton Sea closed basin.
                              California.
                                Area =     7250 sq.mi.

      Cataloging Unit   18100200 -- Salton Sea. California.
                                      Area =     7250 sq.mi.


Region 19  Alaska Region -- The drainage within the state of Alaska.
           Includes all of Alaska.


  Subregion  1901 -- Arctic Slope: The North Slope drainage within the
                     United States that discharges into the Arctic
                     Ocean, including the bays, islands, and associated
                     waters, from the Alaska-Yukon international
                     boundary to Cape Lisburne. Alaska.
                       Area =    81000 sq.mi.

    Accounting Unit 190100 -- Arctic Slope. Alaska.
                                Area =    81000 sq.mi.

      Cataloging Units  19010001 -- East Arctic Slope. Alaska.
                                      Area =    24000 sq.mi.
                        19010002 -- Colville. Alaska.
                                      Area =    23000 sq.mi.
                        19010003 -- West Arctic Slope. Alaska.
                                      Area =    34000 sq.mi.


  Subregion  1902 -- Northwest Alaska: The coastal drainage from Cape
                     Lisburne to the Yukon River Basin boundary,
                     including the bays, sounds, islands, and
                     associated waters; and St. Lawrence Island. Alaska.
                       Area =    75000 sq.mi.

    Accounting Unit 190200 -- Northwest Alaska. Alaska.
                                Area =    75000 sq.mi.

      Cataloging Units  19020001 -- Kotzebue Sound. Alaska.
                                      Area =    49000 sq.mi.
                        19020002 -- Norton Sound-St. Lawrence Island.
                                    Alaska.
                                      Area =    26000 sq.mi.


  Subregion  1903 -- Yukon: The Yukon River Basin within the United
                     States, including its delta. Alaska.
                       Area =   204000 sq.mi.

    Accounting Unit 190300 -- Yukon. Alaska.
                                Area =   204000 sq.mi.

      Cataloging Units  19030001 -- Fortymile-White. Alaska.
                                      Area =     9700 sq.mi.
                        19030002 -- Upper Yukon. Alaska.
                                      Area =    60000 sq.mi.
                        19030003 -- Middle Yukon. Alaska.
                                      Area =    21000 sq.mi.
                        19030004 -- Tanana. Alaska.
                                      Area =    44000 sq.mi.
                        19030005 -- Koyukuk. Alaska.
                                      Area =    32000 sq.mi.
                        19030006 -- Lower Yukon. Alaska.
                                      Area =    37000 sq.mi.


  Subregion  1904 -- Southwest Alaska: The coastal drainage from the
                     Yukon River Basin boundary to Kupreanof Point on the
                     Alaska Peninsula, including the bays, islands, and
                     associated waters; and the islands of St. Matthew,
                     Nunivak and Pribilof, and all of the Aleutian
                     Islands. Alaska.
                       Area =   124000 sq.mi.

    Accounting Unit 190400 -- Southwest Alaska. Alaska.
                                Area =   124000 sq.mi.

      Cataloging Units  19040001 -- Kuskokwim Bay-Nunivak Island-St.
                                    Matthew Island. Alaska.
                                      Area =    61000 sq.mi.
                        19040002 -- Bristol Bay. Alaska.
                                      Area =    43000 sq.mi.
                        19040003 -- Aleutian-Pribilof Islands. Alaska.
                                      Area =    20000 sq.mi.


  Subregion  1905 -- South Central Alaska: The coastal drainage within
                     the United States from Kupreanof Point on the
                     Alaska Peninsula to the Alaska-Yukon international
                     boundary and southward to Point Riou, including the
                     bays, islands, sounds, and associated waters.
                     Alaska.
                       Area =    99000 sq.mi.

    Accounting Unit 190500 -- South Central Alaska. Alaska.
                                Area =    99000 sq.mi.

      Cataloging Units  19050001 -- Kodiak-Shelikof. Alaska.
                                      Area =    12000 sq.mi.
                        19050002 -- Cook Inlet. Alaska.
                                      Area =    47000 sq.mi.
                        19050003 -- Gulf of Alaska. Alaska.
                                      Area =    40000 sq.mi.


  Subregion  1906 -- Southeast Alaska: The coastal drainage within the
                     United States from Point Riou to the Alaksa-British
                     Columbia international boundary, including the bays,
                     islands, sounds, and associated waters.  Alaska.
                       Area =      49000 sq.mi.

    Accounting Unit 190600 -- Southeast Alaska. Alaska.
                                Area =    49000 sq.mi.

      Cataloging Unit   19060000 -- Southeast Alaska. Alaska.
                                      Area =    49000 sq.mi.


Region 20  Hawaii Region -- The drainage within the state of Hawaii.
           Includes all of Hawaii.


  Subregion  2001 -- Hawaii: The drainage on the island of Hawaii; and
                     associated waters. Hawaii.
                       Area =     4030 sq.mi.

    Accounting Unit 200100 -- Hawaii. Hawaii.
                                Area =     4030 sq.mi.

      Cataloging Unit   20010000 -- Hawaii. Hawaii.
                                      Area =     4030 sq.mi.


  Subregion  2002 -- Maui: The drainage on the island of Maui; and
                     associated waters. Hawaii.
                       Area =      730 sq.mi.

    Accounting Unit 200200 -- Maui. Hawaii.
                                Area =      730 sq.mi.

      Cataloging Unit   20020000 -- Maui. Hawaii.
                                      Area =      730 sq.mi.


  Subregion  2003 -- Kahoolawe: The drainage on the island of Kahoolawe;
                     and associated waters. Hawaii.
                       Area =       45 sq.mi.

    Accounting Unit 200300 -- Kahoolawe. Hawaii.
                                Area =       45 sq.mi.

      Cataloging Unit   20030000 -- Kahoolawe. Hawaii.
                                      Area =       45 sq.mi.


  Subregion  2004 -- Lanai: The drainage on the island of Lanai; and
                     associated waters. Hawaii.
                       Area =      140 sq.mi.

    Accounting Unit 200400 -- Lanai. Hawaii.
                                Area =      140 sq.mi.

      Cataloging Unit   20040000 -- Lanai. Hawaii.
                                      Area =      140 sq.mi.


  Subregion  2005 -- Molokai: The drainage on the island of Molokai; and
                     associated waters. Hawaii.
                       Area =      260 sq.mi.

    Accounting Unit 200500 -- Molokai. Hawaii.
                                Area =      260 sq.mi.

      Cataloging Unit   20050000 -- Molokai. Hawaii.
                                      Area =      260 sq.mi.


  Subregion  2006 -- Oahu: The drainage on the island of Oahu; and
                     associated waters. Hawaii.
                       Area =      630 sq.mi.

    Accounting Unit 200600 -- Oahu. Hawaii.
                                Area =      630 sq.mi.

      Cataloging Unit   20060000 -- Oahu. Hawaii.
                                      Area =      630 sq.mi.


  Subregion  2007 -- Kauai: The drainage on the island of Kauai; and
                     associated waters. Hawaii.
                       Area =      560 sq.mi.

    Accounting Unit 200700 -- Kauai. Hawaii.
                                Area =      560 sq.mi.

      Cataloging Unit   20070000 -- Kauai. Hawaii.
                                      Area =      560 sq.mi.


  Subregion  2008 -- Niihau: The drainage on the islands of Niihau
                     and Kaula; and associated waters. Hawaii.
                       Area =       72 sq.mi.

    Accounting Unit 200800 -- Niihau. Hawaii.
                                Area =       72 sq.mi.

      Cataloging Unit   20080000 -- Niihau. Hawaii.
                                      Area =       72 sq.mi.


  Subregion  2009 -- Northwestern Hawaiian Islands: The drainage on
                     Kure, Laysan, Lisianski, Necker, and Nihoa Islands;
                     Gardner Pinnacles; Maro, and Pearl and Hermes
                     Reefs; French Frigate Shoals; and other islets,
                     reefs, and associated waters northwest of Niipau
                     Island. Hawaii.
                       Area =     < 10 sq.mi.

    Accounting Unit 200900 -- Northwestern Hawaiian Islands. Hawaii.
                                Area =     < 10 sq.mi.

      Cataloging Unit   20090000 -- Northwestern Hawaiian Islands.
                                    Hawaii.
                                      Area =     < 10 sq.mi.


Region 21  Caribbean Region -- The drainage within: (a) the Commonwealth
           of Puerto Rico; (b) the Virgin Islands of the United States;
           and (c) other United States Caribbean outlying areas. Includes
           land areas over which the United States has some degree of
           interest, jurisdiction, or sovereignty.


  Subregion  2101 -- Puerto Rico: The drainage and associated waters
                     within the Commonwealth of Puerto Rico.
                     Puerto Rico.
                       Area =     3480 sq.mi.

    Accounting Unit 210100 -- Puerto Rico. Commonwealth of Puerto Rico.
                                Area =     3480 sq.mi.

      Cataloging Units  21010001 -- Interior Puerto Rico.
                                    Puerto Rico.
                                      Area =      404 sq.mi.
                        21010002 -- Cibuco-Guajataca. Puerto Rico.
                                      Area =      566 sq.mi.
                        21010003 -- Culebrinas-Guanajibo. Puerto Rico.
                                      Area =      504 sq.mi.
                        21010004 -- Southern Puerto Rico.
                                    Puerto Rico.
                                      Area =      851 sq.mi.
                        21010005 -- Eastern Puerto Rico. Puerto Rico.
                                      Area =     1067 sq.mi.
                        21010006 -- Puerto Rican Islands. Puerto Rico.
                                      Area =       92 sq.mi.


  Subregion  2102 -- Virgin Islands: The drainage and associated waters
                     within the Virgin Islands of the United States.
                     U.S. Virgin Islands.
                       Area =      133 sq.mi.

    Accounting Unit 210200 -- Virgin Islands. U.s. Virgin Islands.
                                Area =      133 sq.mi.

      Cataloging Units  21020001 -- St. John-St. Thomas.
                                    U.s. Virgin Islands.
                                      Area =       51 sq.mi.
                        21020002 -- St. Croix. U.s. Virgin Islands.
                                      Area =       82 sq.mi.


  Subregion  2103 -- Caribbean Outlying Areas: The drainage and
                     associated waters within the Canal Zone, Navassa
                     Island, and Rancador and Serrana Banks.
                       Area =      650 sq.mi.

    Accounting Unit 210300 -- Caribbean Outlying Areas.
                                Area =      650 sq.mi.

      Cataloging Units  21030001 -- Canal Zone. Panama Canal Zone.
                                      Area =      647 sq.mi.
                        21030002 -- Navassa. Navassa Island.
                                      Area =        2 sq.mi.
                        21030003 -- Roncador-Serrana. Roncador and
                                    Serrana Banks.
                                      Area =      < 1 sq.mi.