11429350 LOON LAKE NEAR MEEKS BAY, CA LOCATION.--Lat 38°58'59", long 120°19'22", in SE 1/4 SW 1/4 sec.8, T.13 N., R.15 E., El Dorado County, Hydrologic Unit 18020128, Eldorado National Forest, in powerplant intake structure, 1.6 mi southwest of right bank end of Loon Lake Dam on Gerle Creek, and 10 mi southwest of Meeks Bay. DRAINAGE AREA.--7.96 mi2. PERIOD OF RECORD.--December 1963 to current year. CHEMICAL ANALYSES.--June to September 1996. REVISED RECORDS.--WDR CA-76-4: Drainage area. GAGE.--Water-stage recorder. Datum of gage is sea level (levels by Sacramento Municipal Utility District). Prior to Sept. 23, 1975, at site 1.6 mi northeast on right bank end of Loon Lake Dam at same datum. REMARKS.--Reservoir is formed by an earthfill dam completed Dec. 27, 1963; storage began Dec. 5, 1963. Prior to September 1962, reservoir was formed by granite-block dam built in 1884, capacity, 8,000 acre-ft. Usable capacity, 73,868 acre-ft, between elevations 6,325 ft, invert of fishwater release valve, and 6,410 ft, crest of spillway. Dead storage, 2,300 acre-ft. Lake receives water from Rubicon River via Rubicon- Rockbound tunnel to Buck Island Lake and from Buck Island Lake to Loon Lake via Buck-Loon Tunnel (stations 11427940, 11428300). Records, including extremes, represent total contents. See schematic diagram of Middle Fork American and Rubicon River basins. COOPERATION.--Records were collected by Sacramento Municipal Utility District, under general supervision of the U.S. Geological Survey, in connection with a Federal Energy Regulatory Commission project. Contents not rounded to U.S. Geological Survey standards. EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 77,700 acre-ft, June 6, 1969, elevation, 6,411.1 ft; minimum since reservoir first filled, 3,262 acre-ft, Nov. 8, 9, 1988, elevation, 6,328.70 ft. EXTREMES FOR CURRENT YEAR.--Maximum contents, 76,056 acre-ft, June 4, elevation, 6,409.92 ft; minimum, 17,067 acre-ft, Mar. 18, elevation, 6,356.74 ft. Capacity table (elevation, in feet, and contents, in acre-feet) (Based on table provided by Sacramento Municipal Utility District recomputed October 1991) 6,330 3,478 6,370 28,323 6,340 7,116 6,390 50,058 6,350 12,469 6,412 78,983 6,360 19,570 RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997 DAILY OBSERVATION AT 2400 HOURS DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 52039 45422 43919 63399 66895 37180 23609 46826 75832 75469 66522 42435 2 52003 44045 42765 67484 65829 35489 23890 47547 75707 75581 66255 40916 3 51978 42742 41353 69452 65192 34381 24119 48307 75525 75483 65935 39541 4 51941 41174 39894 70660 64808 33657 24349 49311 76056 75428 65378 38522 5 51917 39651 41746 71192 64346 32685 24598 50565 75986 75400 64742 37719 6 51892 38065 43163 71384 64082 31048 24866 51758 75651 75177 64240 37213 7 51843 36923 43689 71370 63753 29138 25144 52604 75553 74913 63189 36741 8 51795 36613 44080 71370 63176 27397 25451 53887 75721 74274 62260 36315 9 51746 36219 44760 71411 62979 25542 25751 55295 75832 73790 62221 36230 10 51709 35838 45666 71384 62574 24022 26052 56778 75609 73237 62182 36187 11 51672 35437 46615 71302 61869 22795 26328 58250 75539 72920 61895 36155 12 51624 34787 48940 71124 60922 21852 26605 59260 75693 72700 60806 35869 13 51575 34350 50893 70756 59350 20227 26967 60224 75734 72618 59530 35827 14 51550 34318 51721 70497 58123 18830 27472 61492 75734 72356 58748 35774 15 51489 34308 52100 70116 56981 18158 28085 62691 75762 71863 57868 35743 16 51465 34267 52260 69709 55947 18304 29022 63622 75790 71904 57424 35711 17 51416 35227 52198 69506 54621 17567 29915 64729 75553 71671 57246 35647 18 51392 37633 51966 69411 53640 17067 30750 65975 75874 71083 56463 35574 19 51355 39222 51660 69208 52444 17238 33042 67176 75776 70620 55809 35574 20 51319 39828 51453 69195 51087 17574 35185 68398 75456 70565 55132 35500 21 51307 40883 51721 69154 50118 17664 37374 69316 75665 70021 53664 35458 22 51307 42515 51733 69492 49179 17349 39244 69791 75581 69668 52358 35426 23 50759 43426 51709 69370 47748 17417 40816 70293 75623 69682 51246 35384 24 49925 43942 51636 69249 46075 17990 41454 71083 75400 69316 50590 35353 25 49167 44241 51575 69777 44011 18566 42073 71767 75469 68627 50190 35321 26 48509 44126 51660 70388 42220 19135 42696 72288 75456 68385 49167 35279 27 47796 43392 52003 70347 41028 20163 43747 72810 75539 68196 48176 35237 28 47641 43529 52064 69709 39255 21127 44888 73555 75595 68169 47677 35185 29 47641 43609 52530 68978 --- 21827 45340 73859 75609 67927 46544 35143 30 47665 43678 54334 68533 --- 22538 46110 74635 75734 67793 45445 35111 31 46897 --- 57614 67901 --- 23149 --- 75386 --- 66855 44057 --- MAX 52039 45422 57614 71411 66895 37180 46110 75386 76056 75581 66522 42435 MIN 46897 34267 39894 63399 39255 17067 23609 46826 75400 66855 44057 35111 a 6387.35 6384.58 6396.10 6403.97 6380.64 6364.31 6386.68 6409.44 6409.69 6403.19 6384.91 6376.78 b -5167 -3219 +13936 +10287 -28646 -16106 +22961 +29276 +348 -8879 -22798 -8946 CAL YR 1996 MAX 77092 MIN 34267 b +15980 WTR YR 1997 MAX 76056 MIN 17067 b -16953
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