11530500 KLAMATH RIVER NEAR KLAMATH, CA
LOCATION.-Lat 41°30'52", long 123°59'57", in SW 1/4, sec.13, T.13 N., R.2 E., Del Norte County,
Hydrologic Unit 18010209, on right bank, 0.2 mi upstream from Turwar Creek, and 2.2 mi southeast of Klamath.
DRAINAGE AREA.-12,100 mi2, approximately (not including Lost River or Lower Klamath Lake Basins).
PERIOD OF RECORD.-October 1910 to December 1926 (published as "near Requa"), October 1950 to September 1994,
October 1995 to September 1997 (stage only), and October 1997 to current year. Monthly discharge only for some
periods, published in WSP 1315-B.
CHEMICAL DATA: Water years 1951-95.
BIOLOGICAL DATA: Water years 1975-81.
SPECIFIC CONDUCTANCE: Water years 1975-81.
WATER TEMPERATURE: Water years 1966-81.
SEDIMENT DATA: Water years 1955-56, 1975-95.
REVISED RECORDS.-WSP 1285: 1951(P). WSP 1445: 1918-20. WDR CA-81-2: 1980.
GAGE.-Water-stage recorder and crest-stage gage. Datum of gage is sea level. Prior to June 1926, nonrecording
gage at site 2.6 mi upstream at different datum. Oct. 1, 1950, to Oct. 2, 1975, water-stage recorder at site 2.6
mi upstream at datum 5.60 ft above sea level.
REMARKS.-Records good except for estimated daily discharges, which are fair. Medium and low flows considerably
regulated by reservoirs and powerplants upstream from station and by transbasin diversion (from Trinity River) to
Judge Francis Carr Powerplant (station 11525430) since April 1963. Large diversions for irrigation upstream from
station. See schematic diagram of Klamath River and Trinity River Basins.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 557,000 ft3/s, Dec. 23, 1964, gage height, 55.3 ft,
former datum, from floodmarks, from rating curve extended above 230,000 ft3/s on basis of
flood-routing study; minimum daily, 1,310 ft3/s, Sept. 4, 1977.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 4100 4830 63200 18300 25800 128000 35400 29500 27400 11500 5280 4210
2 4130 5110 82300 17200 24000 94300 34500 32400 26000 11000 5220 4330
3 4160 4900 101000 16400 22900 85700 33200 36500 22800 10200 5180 4420
4 4170 5060 69400 15600 22700 77400 32000 34300 20500 9620 5160 4350
5 4180 5270 49600 15000 21900 65900 31900 30100 20200 9190 5060 4270
6 4200 5800 41100 14500 29400 57600 31700 27800 20700 8900 5000 4340
7 4270 7610 35300 14100 57300 51900 29500 29000 19700 8780 5230 4300
8 4630 8390 34600 13700 76400 49400 29500 28600 18500 8640 5340 4240
9 4700 7390 31300 13300 62200 48900 29100 26800 17600 8290 5250 4220
10 4410 6430 28300 13000 51500 44900 28900 25500 17200 8060 5090 4230
11 4270 8110 26100 12800 43400 42000 31400 25000 17200 8000 5010 4210
12 4290 7420 26000 12700 38600 39600 30400 26600 17900 7910 5090 4170
13 e4550 6630 28200 12400 35700 38300 31000 28100 18400 7830 4910 4120
14 e4490 6280 29600 12700 35400 39000 33400 27200 19000 7760 4810 4520
15 e4380 6350 27300 22800 34400 40200 36100 25600 19800 7470 4750 5040
16 e4270 7540 25100 29600 35500 39200 38300 24000 19800 7090 4680 4440
17 e4210 10400 23900 32200 59200 37900 41300 23500 18800 6850 4590 4080
18 4090 11200 23400 60900 68800 36400 45300 25700 18100 6700 4500 4040
19 4110 9340 22400 58300 84500 36300 46000 28400 17000 6530 4430 4040
20 4110 9240 21400 57700 68200 39000 44000 29100 16100 6290 4400 4030
21 4080 89500 19800 69400 61800 40900 41100 28500 15800 6190 4350 4030
22 4060 101000 18500 69500 58700 39700 38000 27500 15600 6110 4310 4020
23 4010 63100 17700 108000 72200 38400 35500 30200 15500 6020 4270 4000
24 4430 84200 17000 84600 75500 40400 35400 33700 15000 5920 4260 4010
25 5600 53900 16700 61200 77100 47800 38500 36600 14400 5910 4290 4000
26 5230 48500 17000 49500 73500 46000 40000 36300 13500 5840 4310 3980
27 4760 51600 16800 42100 70100 41900 38500 35600 12500 5760 4270 3980
28 4590 39900 18000 37000 114000 38400 35200 35300 11900 5700 4220 3980
29 4500 34900 18200 33700 --- 36500 32000 32900 11700 5600 4210 3990
30 4450 40700 17500 30600 --- 36300 29700 30500 11700 5490 4180 4000
31 4480 --- 17900 28100 --- 36900 --- 27900 --- 5370 4160 ---
TOTAL 135910 750600 984600 1076900 1500700 1535100 1056800 918700 530300 230520 145810 125590
MEAN 4384 25020 31760 34740 53600 49520 35230 29640 17680 7436 4704 4186
MAX 5600 101000 101000 108000 114000 128000 46000 36600 27400 11500 5340 5040
MIN 4010 4830 16700 12400 21900 36300 28900 23500 11700 5370 4160 3980
AC-FT 269600 1489000 1953000 2136000 2977000 3045000 2096000 1822000 1052000 457200 289200 249100
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1911 - 1962, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 4987 11130 19480 27730 37540 27340 27710 23170 13830 5921 3383 3339
MAX 18950 30460 72580 83550 123200 53280 48860 37250 29580 12370 5871 5107
(WY) 1951 1921 1956 1953 1958 1957 1952 1952 1953 1953 1953 1912
MIN 2700 3502 4138 7454 6263 6916 6270 3975 2106 1731 1567 1860
(WY) 1920 1960 1960 1924 1920 1924 1924 1924 1924 1924 1918 1918
SUMMARY STATISTICS WATER YEARS 1911 - 1962
ANNUAL MEAN 17010
HIGHEST ANNUAL MEAN 33360 1958
LOWEST ANNUAL MEAN 5156 1924
HIGHEST DAILY MEAN 378000 Dec 22 1955
LOWEST DAILY MEAN 1340 Jul 31 1924
ANNUAL SEVEN-DAY MINIMUM 1440 Jul 30 1924
INSTANTANEOUS PEAK FLOW a425000 Dec 22 1955
INSTANTANEOUS PEAK STAGE b49.7 Dec 22 1955
ANNUAL RUNOFF (AC-FT) 12320000
10 PERCENT EXCEEDS 37300
50 PERCENT EXCEEDS 10200
90 PERCENT EXCEEDS 2860
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1963 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 4933 15110 26720 34030 34020 34790 26610 19760 11480 4741 3144 3262
MAX 17830 55620 87770 97760 102700 82410 60400 40080 30060 12220 6599 5923
(WY) 1963 1974 1965 1970 1986 1983 1974 1983 1998 1983 1983 1983
MIN 2134 3236 3942 4212 4231 6954 5448 5638 3630 1782 1441 1977
(WY) 1995 1988 1977 1977 1977 1977 1977 1977 1977 1977 1977 1991
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1963 - 1999
ANNUAL TOTAL 11641570 8991530
ANNUAL MEAN 31890 24630 17970
HIGHEST ANNUAL MEAN 36100 1983
LOWEST ANNUAL MEAN 4036 1977
HIGHEST DAILY MEAN 209000 Jan 17 128000 Mar 1 420000 Dec 23
1964
LOWEST DAILY MEAN 3970 Sep 1 3980 Sep 26 1310 Sep 4
1977
ANNUAL SEVEN-DAY MINIMUM 4050 Sep 15 3990 Sep 23 1370 Aug 18
1977
INSTANTANEOUS PEAK FLOW 141000 Feb 28 557000 Dec 23
1964
INSTANTANEOUS PEAK STAGE 24.68 Feb 28 55.30 Dec 23
1964
ANNUAL RUNOFF (AC-FT) 23090000 17830000 13020000
10 PERCENT EXCEEDS 72800 57400 41000
50 PERCENT EXCEEDS 26400 18300 9760
90 PERCENT EXCEEDS 4200 4230 2830
a From rating curve extended above 140,000 ft3/s on basis of flood-routing study.
b From floodmarks, site and datum then in use.
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