11234760 SAN JOAQUIN RIVER ABOVE SHAKEFLAT CREEK, NEAR BIG CREEK, CA
LOCATION.--Lat 37°19'00", long 119°19'43", in NE 1/4 SE 1/4 sec.15, T.7 S., R.24 E., Madera County, Hydrologic
Unit 18040006, Sierra National Forest, on right bank 1,500 ft upstream from Shakeflat Creek, 4,900 ft
downstream from Mammoth Pool Dam, and 9.0 mi northwest of town of Big Creek.
DRAINAGE AREA.--1,003 mi2.
PERIOD OF RECORD.--October 1959 to current year.
GAGE.--Water-stage recorder. Datum of gage is 2,865.50 ft above sea level (levels by Southern California Edison
Co.). Since 1961, supplementary water-stage recorder and sharp-crested weir at different datum at outlet of
dam 4,900 ft upstream, used for low flows of 60 ft3/s or less.
REMARKS.--Flow regulated by Mammoth Pool Reservoir (station 11234700) 4,900 ft upstream. Diversions upstream
through Ward Tunnel (see stations 11229500 and 11235500). Since March 1960, most of the water is diverted
past this station to Mammoth Pool Powerplant (station 11235100). See schematic diagrams of lower San Joaquin
River basins.
COOPERATION.--Records were collected by Southern California Edison 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, 24,700 ft3/s, May 16, 1996, gage height, 20.44 ft; minimum
daily, 0.3 ft3/s, Oct. 14, Dec. 5, 1959.
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 e27 e35 12 12 11 379 26 53 1550 28 28 27
2 e27 16 12 12 11 376 11 53 2310 28 28 27
3 e27 11 12 12 11 374 10 53 3060 795 28 27
4 e27 11 11 12 11 185 10 54 3490 683 27 26
5 e27 11 11 12 12 51 10 54 3500 246 27 27
6 e27 11 11 12 12 51 10 54 3920 139 27 27
7 e27 11 11 12 12 50 11 54 4980 107 27 27
8 e27 11 11 12 12 50 11 743 5620 290 30 27
9 e27 11 11 12 12 50 11 1920 5040 378 e35 27
10 e27 11 11 11 12 49 11 2390 4580 335 e35 27
11 e27 11 11 11 12 49 28 3210 3460 206 e35 27
12 e27 11 11 11 12 49 51 4060 2780 195 e35 27
13 e27 11 11 11 12 50 51 4440 2670 515 e35 26
14 e27 11 11 11 12 50 51 4310 2230 160 e35 26
15 e27 11 12 11 12 50 51 4670 2190 28 e35 26
16 e27 11 12 11 12 50 42 18100 2200 27 e35 26
17 e27 11 12 11 12 49 20 6610 2120 28 e35 26
18 e27 11 12 11 12 49 20 5360 2360 28 e35 26
19 e27 11 12 11 29 49 20 4350 2050 28 e35 27
20 e27 11 12 11 66 49 33 2850 2220 28 e35 28
21 e27 11 12 11 62 49 49 2510 2190 28 e35 28
22 e27 11 12 11 219 49 49 1810 1690 28 e33 28
23 e27 11 12 11 396 49 49 1670 1510 28 28 28
24 e30 11 12 11 394 49 49 1300 1530 28 27 28
25 e34 11 12 11 393 48 50 2180 815 28 27 28
26 e35 11 12 11 390 48 50 1830 204 28 27 27
27 e35 11 12 11 387 50 50 1870 38 28 27 27
28 e35 11 12 11 384 50 51 1220 28 28 27 27
29 e35 11 12 11 383 50 52 1000 28 28 27 27
30 e35 11 12 11 --- 50 53 930 28 28 27 27
31 e35 --- 12 11 --- 50 --- 1040 --- 28 27 ---
TOTAL 895 359 361 350 3315 2651 990 80748 70391 4580 954 809
MEAN 28.9 12.0 11.6 11.3 114 85.5 33.0 2605 2346 148 30.8 27.0
MAX 35 35 12 12 396 379 53 18100 5620 795 35 28
MIN 27 11 11 11 11 48 10 53 28 27 27 26
AC-FT 1780 712 716 694 6580 5260 1960 160200 139600 9080 1890 1600
a 38100 34950 34940 27040 70100 157200 149900 136200 130500 113200 67770 48890
e Estimated.
a Diversion, in acre-feet, to Mammoth Pool Powerplant, provided by Southern California Edison Co.
11234760 SAN JOAQUIN RIVER ABOVE SHAKEFLAT CREEK, NEAR BIG CREEK, CA--Continued
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1960 - 1996, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 23.3 12.9 15.1 28.4 64.6 105 218 1420 2099 889 75.1 22.3
MAX 61.9 20.1 66.3 422 754 1111 2489 9681 12400 7169 1184 45.3
(WY) 1960 1974 1967 1967 1980 1995 1995 1969 1983 1995 1983 1978
MIN 12.6 .82 3.06 10.2 10.8 10.9 12.3 12.9 11.8 12.4 12.8 12.4
(WY) 1961 1960 1960 1986 1985 1960 1964 1961 1961 1961 1972 1960
SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1960 - 1996
ANNUAL TOTAL 717160 166403
ANNUAL MEAN 1965 455 415
HIGHEST ANNUAL MEAN 2022 1983
LOWEST ANNUAL MEAN 13.2 1961
HIGHEST DAILY MEAN 13500 Jul 9 18100 May 16 18100 May 16 1996
LOWEST DAILY MEAN 11 Jan 1 10 Apr 3 .30 Oct 14 1959
ANNUAL SEVEN-DAY MINIMUM 11 Nov 3 10 Apr 2 .57 Dec 1 1959
INSTANTANEOUS PEAK FLOW 24700 May 16 24700 May 16 1996
INSTANTANEOUS PEAK STAGE 20.44 May 16 20.44 May 16 1996
ANNUAL RUNOFF (AC-FT) 1422000 330100 300700
TOTAL DIVERSION (AC-FT) a 916100 1009000
10 PERCENT EXCEEDS 6920 1820 391
50 PERCENT EXCEEDS 242 28 15
90 PERCENT EXCEEDS 11 11 12
a Diversion, in acre-feet, to Mammoth Pool Powerplant, provided by Southern California Edison Co.
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