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 Basin.
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, 80,000 ft3/s, Jan. 2, 1997, gage height, 32.00 ft from floodmarks, from rating curve extended above
20,300 ft3/s; minimum daily, 0.3 ft3/s, Oct. 14, Dec. 5, 1959.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 61 53 12 e12 11 12 33 59 3590 9440 522 36
2 62 28 12 e12 11 12 33 61 4430 10400 461 36
3 62 13 12 e12 11 12 33 61 4680 9560 992 34
4 62 13 12 e12 11 12 32 61 3460 8620 1260 30
5 62 11 12 e12 11 12 32 62 3700 8110 736 33
6 62 11 12 e12 11 12 32 63 4990 8080 465 35
7 62 11 12 e12 11 12 32 64 6820 8030 231 33
8 62 11 12 e12 11 12 30 63 5750 8530 440 36
9 61 11 12 e12 11 11 29 63 5580 9140 976 35
10 61 11 11 e12 11 11 28 63 5500 8630 405 42
11 61 11 11 e12 11 11 29 63 5100 6850 71 42
12 61 11 11 e12 11 11 29 64 4930 6690 68 42
13 61 11 11 e12 11 11 29 64 4300 6410 68 42
14 61 11 11 e12 11 11 29 65 6290 6250 68 42
15 60 11 11 e11 11 11 29 65 7990 5870 68 42
16 60 12 e12 11 11 11 28 65 9650 5730 68 42
17 59 11 e12 12 11 11 28 65 7980 5100 68 41
18 59 11 e12 12 11 11 29 65 7660 5530 67 41
19 58 12 e12 12 11 12 29 65 8440 6330 67 41
20 58 12 e12 12 11 12 29 65 8690 7080 66 41
21 57 12 e12 12 11 12 30 66 9070 8170 66 36
22 57 12 e12 11 11 12 31 66 9570 7040 66 30
23 56 12 e12 11 12 12 31 66 9850 5980 66 30
24 56 12 e12 11 12 29 32 66 9550 4650 65 30
25 56 12 e12 11 12 40 32 67 9970 3860 65 30
26 55 12 e12 11 11 40 33 e1150 8990 3100 52 30
27 55 12 e12 11 12 40 33 e1350 8520 2400 36 30
28 55 12 e12 11 12 31 46 1170 8810 2240 36 31
29 54 12 e12 11 --- 33 59 1810 9170 1860 37 30
30 54 12 e12 11 --- 33 60 1490 9510 1980 37 31
31 53 --- e12 11 --- 33 --- 2050 --- 1360 37 ---
TOTAL 1823 406 366 360 313 545 989 10617 212540 193020 7730 1074
MEAN 58.8 13.5 11.8 11.6 11.2 17.6 33.0 342 7085 6226 249 35.8
MAX 62 53 12 12 12 40 60 2050 9970 10400 1260 42
MIN 53 11 11 11 11 11 28 59 3460 1360 36 30
AC-FT 3620 805 726 714 621 1080 1960 21060 421600 382900 15330 2130
a 26850 23290 23960 33450 56410 102300 106100 138100 118900 104600 85090 79770
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1960 - 1998, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 24.3 13.0 15.2 101 70.2 101 216 1454 2223 1004 78.6 23.1
MAX 61.9 20.1 66.3 2872 754 1111 2489 9681 12400 7169 1184 45.3
(WY) 1960 1974 1967 1997 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 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1960 - 1998
ANNUAL TOTAL 292332 429783
ANNUAL MEAN 801 1177 445
HIGHEST ANNUAL MEAN 2022 1983
LOWEST ANNUAL MEAN 13.2 1961
HIGHEST DAILY MEAN 26000 Jan 3 10400 Jul 2 26000 Jan 3 1997
LOWEST DAILY MEAN 11 Nov 5 11 Nov 5 .30 Oct 14 1959
ANNUAL SEVEN-DAY MINIMUM 11 Nov 5 11 Nov 5 .57 Dec 1 1959
INSTANTANEOUS PEAK FLOW 11400 Jun 16 80000 Jan 2 1997
INSTANTANEOUS PEAK STAGE 15.55 Jun 16 32.00 Jan 2 1997
ANNUAL RUNOFF (AC-FT) 579800 852500 322000
TOTAL DIVERSION (AC-FT) a 970400 898900
10 PERCENT EXCEEDS 3000 6090 642
50 PERCENT EXCEEDS 36 33 15
90 PERCENT EXCEEDS 12 11 12
a Diversion, in acre-feet, to Mammoth Pool Powerplant, provided by Southern California Edison Co.
USGS Water Resources of California
Contact:
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Last modified: Wed Aug 4 09:40:29 PDT 1999