11516530 KLAMATH RIVER BELOW IRON GATE DAM, CA
LOCATION.--Lat 41°55'41", long 122°26'35", in SE 1/4 NE 1/4 sec.17, T.47 N., R.5 W., Siskiyou County, Hydrologic
Unit 18010206, on left bank 0.1 mi downstream from Bogus Creek, 0.6 mi downstream from Iron Gate Dam, and
5.9 mi northeast of Hornbrook.
DRAINAGE AREA.--4,630 mi2, approximately (not including Lost River, Butte Creek, or Lower Klamath Lake basins).
PERIOD OF RECORD.--October 1960 to current year.
CHEMICAL DATA: Water years 1962-81.
WATER TEMPERATURE: Water years 1963-80.
GAGE.--Water-stage recorder. Datum of gage is 2,162.44 ft above sea level (levels by PacifiCorp, formerly
Pacific Power & Light Co.).
REMARKS.--Records excellent. Flow regulated by Upper Klamath Lake, capacity, 523,700 acre-ft; Iron Gate
Reservoir (station 11516510), other smaller reservoirs, and diversions upstream from station. See schematic
diagram of Klamath River and Trinity River basins.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 29,400 ft3/s, Dec. 22, 1964, gage height, 13.63 ft, from
rating curve extended above 15,000 ft3/s on basis of slope-area measurement of peak flow; minimum daily,
389 ft3/s, Aug. 25-28, 1992.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 1350 1340 1350 3320 5480 7270 3100 3630 2030 1090 1060 1080
2 1350 1340 1340 3460 5330 6050 3090 3400 1780 1050 1070 1080
3 1350 1340 1340 3330 4830 6640 3060 2880 1740 1070 1070 1080
4 1350 1340 1360 3210 5620 7130 3040 2680 1690 1070 1060 1080
5 1350 1340 1360 3190 6440 7220 3030 2670 1570 1060 1060 1230
6 1350 1340 1350 3180 8750 7200 3010 2540 1410 1060 1060 1380
7 1350 1340 1350 3170 11300 6640 3000 2250 1420 1060 1060 1380
8 1360 1340 1340 3160 11300 6420 3000 1930 1420 1060 1060 1370
9 1350 1340 1350 3320 11000 6380 3010 1630 1430 1050 1060 1370
10 1350 1340 1350 3430 10700 6320 3010 1420 1410 1030 1060 1360
11 1350 1340 1350 3290 9270 6260 2850 1420 1410 1030 1060 1360
12 1350 1340 2430 3250 8260 6420 2830 1620 1440 1030 1060 1380
13 1350 1340 3170 3230 8380 6030 2810 1640 1440 1030 1050 1360
14 1350 1340 2030 3210 8350 5760 2790 1650 1440 1030 1040 1350
15 1350 1340 2160 3520 8260 6040 2700 1700 1440 1030 1040 1360
16 1340 1340 2300 4420 8940 5920 2870 1850 1440 1030 1050 1350
17 1340 1330 2200 4050 9400 5830 2870 3280 1450 1030 1060 1350
18 1340 1330 2110 3860 9420 5670 3080 4390 1490 1030 1060 1350
19 1340 1330 1840 4010 10400 5530 3280 5190 1540 1030 1050 1350
20 1340 1330 1390 4860 10500 5480 3370 4440 1540 1030 1080 1360
21 1340 1330 1350 4810 10800 4760 3380 4340 1540 1030 1070 1360
22 1340 1330 1350 4600 12000 4060 3360 4820 1540 1030 1070 1350
23 1340 1330 1350 4310 12000 3400 3350 4740 1540 1030 1080 1360
24 1340 1330 1350 4310 11200 3360 3920 5640 1540 1030 1080 1360
25 1340 1330 1350 4290 9970 3110 4140 6390 1540 1030 1080 1360
26 1340 1340 1350 4220 9060 2630 4100 6310 1550 1030 1080 1350
27 1340 1340 1330 4300 9230 2680 4800 5910 1560 1030 1080 1350
28 1340 1340 1340 4280 8360 2740 5050 3540 1540 1040 1080 1340
29 1340 1340 1370 4250 7350 2840 5000 3160 1540 1060 1080 1340
30 1340 1340 2240 4910 --- 3080 4360 2380 1540 1060 1080 1340
31 1340 --- 3300 5700 --- 3050 --- 2220 --- 1070 1080 ---
TOTAL 41700 40110 52150 120450 261900 161920 101260 101660 45960 32340 33030 39490
MEAN 1345 1337 1682 3885 9031 5223 3375 3279 1532 1043 1065 1316
MAX 1360 1340 3300 5700 12000 7270 5050 6390 2030 1090 1080 1380
MIN 1340 1330 1330 3160 4830 2630 2700 1420 1410 1030 1040 1080
AC-FT 82710 79560 103400 238900 519500 321200 200800 201600 91160 64150 65510 78330
11516530 KLAMATH RIVER BELOW IRON GATE DAM, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 1664 2142 2744 2825 3047 3601 2970 2046 1050 758 970 1303
MAX 3353 5254 6735 9489 9150 10780 6922 4973 2591 1429 1208 2052
(WY) 1985 1985 1984 1965 1965 1972 1971 1971 1983 1982 1965 1965
MIN 852 873 889 888 525 511 572 512 506 428 398 538
(WY) 1982 1992 1992 1992 1992 1992 1994 1992 1992 1992 1992 1992
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1961 - 1996
ANNUAL TOTAL 657718 1031970
ANNUAL MEAN 1802 2820 2089
HIGHEST ANNUAL MEAN 3657 1965
LOWEST ANNUAL MEAN 641 1992
HIGHEST DAILY MEAN 8740 Mar 17 12000 Feb 22 25000 Dec 22 1964
LOWEST DAILY MEAN 729 Jul 17 1030 Jul 10 389 Aug 25 1992
ANNUAL SEVEN-DAY MINIMUM 731 Jul 14 1030 Jul 10 390 Aug 24 1992
INSTANTANEOUS PEAK FLOW 12600 Feb 22 29400 Dec 22 1964
INSTANTANEOUS PEAK STAGE 10.06 Feb 22 13.63 Dec 22 1964
INSTANTANEOUS LOW FLOW 389 Aug 25 1992
ANNUAL RUNOFF (AC-FT) 1305000 2047000 1513000
10 PERCENT EXCEEDS 4100 6310 4050
50 PERCENT EXCEEDS 1340 1440 1390
90 PERCENT EXCEEDS 766 1060 730
USGS Water Resources of California
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