USGS
Water Resources Data - California, Water Year 1994
11362500 PIT RIVER BELOW PIT NO. 4 DAM, CA
LOCATION.--Lat 40`58'25", long 121`46'42", unsurveyed, T.36 N., R.2 E., Shasta County, Hydrologic Unit 18020003,
Shasta National Forest, on right bank 0.6 mi downstream from Ruling Creek, 1.3 mi downstream from Pit No. 4
Dam, and 2.7 mi downstream from Pit No. 3 Powerplant.
DRAINAGE AREA.--4,648 mi2, excluding Goose Lake basin.
PERIOD OF RECORD.--May 1922 to current year. Monthly discharge only for some periods, published in WSP 1315-A.
Published as "near Pecks Bridge" April to October 1922, and as "at Lindsay Flat" November 1922 to June 1927.
REVISED RECORDS.--WSP 843: 1935(M). WSP 1315-A: 1928(M). WDR CA-75-4: Drainage area.
GAGE.--Water-stage recorder. Elevation of gage is 2,358 ft above sea level, from river-profile map. Prior to
November 1922, water-stage recorder at site at Pecks Bridge 7.4 mi upstream at different datum. November 1922
to June 20, 1927, at site at Lindsay Flat 1.8 mi upstream at different datum. June 20, 1927, to Sept. 5,
1990, at site 200 ft downstream at datum 0.15 ft lower.
REMARKS.--No estimated daily discharges. Low flow completely regulated by small reservoirs and powerplants,
total usable reservoir capacity, 253,000 acre-ft. Many diversions upstream from station; diversion to Pit
No. 4 Powerplant began June 9, 1955. See schematic diagram of Pit and McCloud River basins.
COOPERATION.--Records were collected by Pacific Gas & Electric Co., under general supervision of the
U.S. Geological Survey, in connection with a Federal Energy Regulatory Commission project.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 33,700 ft3/s, Feb. 20, 1986, gage height, 18.70 ft; minimum
daily, prior to diversion to Pit No. 4 Powerplant in 1955, 234 ft3/s, Sept. 13, 1953. Minimum daily, since
diversion to Pit No. 4 Powerplant, 22 ft3/s, Dec. 2-4, 1969.
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 303 ft3/s, June 1, gage height, 4.00 ft; minimum daily,
155 ft3/s, Jan. 5, 12, 20.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 161 160 162 161 157 161 158 159 171 162 163 162
2 160 164 161 163 159 159 160 159 186 167 161 162
3 160 163 161 163 160 158 162 160 162 162 161 161
4 160 162 163 158 160 157 158 160 160 158 162 160
5 160 160 162 155 160 161 158 160 161 159 161 162
6 160 160 161 159 160 163 158 160 161 159 163 163
7 160 162 159 159 160 164 158 159 160 160 167 163
8 159 160 160 159 161 156 159 160 160 164 164 163
9 161 159 157 158 162 159 161 157 158 161 163 164
10 160 160 159 158 162 162 160 157 160 163 160 164
11 165 163 162 157 156 163 159 159 157 164 160 160
12 161 162 162 155 160 157 159 158 160 165 160 162
13 161 160 162 159 162 159 158 159 160 164 160 164
14 162 160 162 162 162 163 159 160 160 163 161 162
15 165 163 161 160 162 162 157 160 162 163 158 159
16 162 162 161 161 162 163 158 159 163 163 159 159
17 159 161 159 159 162 160 160 158 164 162 161 161
18 159 160 159 159 158 160 160 157 161 165 160 161
19 160 160 161 156 161 158 160 159 162 168 161 163
20 161 162 163 155 159 158 158 156 160 161 160 163
21 162 162 163 157 161 159 157 159 162 164 160 161
22 160 160 161 157 160 159 163 158 162 164 161 161
23 159 160 158 159 158 158 162 157 160 167 160 163
24 159 158 157 159 158 161 163 158 162 165 160 161
25 159 158 157 162 161 158 158 158 159 168 161 160
26 158 163 159 161 159 158 163 163 159 160 159 158
27 160 162 157 157 160 157 158 163 159 164 159 160
28 159 162 157 159 159 160 160 161 160 166 163 162
29 158 163 158 159 --- 161 159 162 162 163 164 164
30 160 161 160 157 --- 160 159 162 161 164 164 164
31 160 --- 160 156 --- 158 --- 158 --- 163 160 ---
TOTAL 4970 4832 4964 4919 4481 4952 4782 4935 4854 5061 4996 4852
MEAN 160 161 160 159 160 160 159 159 162 163 161 162
MAX 165 164 163 163 162 164 163 163 186 168 167 164
MIN 158 158 157 155 156 156 157 156 157 158 158 158
AC-FT 9860 9580 9850 9760 8890 9820 9490 9790 9630 10040 9910 9620
a 91580 88340 92050 87020 85030 117900 79840 99670 76790 65080 68180 68020
b 103600 106600 116300 109700 105500 144400 100200 113800 87660 80730 87330 86100
a Discharge, in acre-feet, for Pit No. 3 Powerplant (station 11362300), provided by Pacific Gas & Electric Co.
b Diversion, in acre-feet, to Pit No. 4 Powerplant (station 11362600), provided by Pacific Gas & Electric Co.
11362500 PIT RIVER BELOW PIT NO. 4 DAM, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1927 - 1954, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 1945 2102 2458 2700 3338 3799 3766 2877 2307 1925 1833 1865
MAX 2385 2544 5968 5523 6872 8510 11400 5507 4096 2652 2146 2318
(WY) 1954 1954 1938 1953 1942 1938 1952 1938 1953 1952 1954 1953
MIN 1571 1666 1745 1698 1742 1895 1730 1635 1612 1569 1509 1541
(WY) 1935 1934 1935 1937 1933 1934 1934 1934 1934 1934 1934 1934
SUMMARY STATISTICS WATER YEARS 1927 - 1954
ANNUAL MEAN 2572
HIGHEST ANNUAL MEAN 4066 1952
LOWEST ANNUAL MEAN 1703 1934
HIGHEST DAILY MEAN 26200 Dec 12 1937
LOWEST DAILY MEAN 234 Sep 13 1953
ANNUAL SEVEN-DAY MINIMUM 1450 Aug 2 1936
INSTANTANEOUS PEAK FLOW a30200 Dec 12 1937
INSTANTANEOUS PEAK STAGE 17.90 Dec 12 1937
ANNUAL RUNOFF (AC-FT) 1863000
10 PERCENT EXCEEDS 3810
50 PERCENT EXCEEDS 2170
90 PERCENT EXCEEDS 1630
a From rating curve extended above 12,000 ft3/s on basis of velocity-area studies.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1955 - 1994, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 240 227 431 890 978 1063 765 397 222 163 163 159
MAX 2189 2436 3791 7250 7657 4805 3416 2539 1479 490 458 268
(WY) 1955 1955 1965 1970 1986 1993 1982 1955 1955 1955 1992 1973
MIN 96.8 66.4 49.8 50.0 49.0 49.7 88.3 128 128 137 120 79.8
(WY) 1962 1957 1979 1981 1981 1981 1961 1961 1961 1964 1955 1955
SUMMARY STATISTICS FOR 1993 CALENDAR YEAR FOR 1994 WATER YEAR WATER YEARS 1955 - 1994
ANNUAL TOTAL 243907 58598
ANNUAL MEAN 668 161 472
HIGHEST ANNUAL MEAN 1868 1955
LOWEST ANNUAL MEAN 98.4 1961
HIGHEST DAILY MEAN 14600 Mar 18 186 Jun 2 31100 Feb 20 1986
LOWEST DAILY MEAN 156 Jan 3 155 Jan 5 22 Dec 2 1969
ANNUAL SEVEN-DAY MINIMUM 157 Jan 7 157 Jan 17 27 Dec 1 1969
INSTANTANEOUS PEAK FLOW 303 Jun 1 33700 Feb 20 1986
INSTANTANEOUS PEAK STAGE 4.00 Jun 1 18.70 Feb 20 1986
ANNUAL RUNOFF (AC-FT) 483800 116200 342300
10 PERCENT EXCEEDS 1700 163 1040
50 PERCENT EXCEEDS 161 160 153
90 PERCENT EXCEEDS 158 158 58
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