11313500 SALT SPRINGS RESERVOIR NEAR WEST POINT, CA
LOCATION.-Lat 38°29'55", long 120°12'52", in NW 1/4 SE 1/4 sec.33, T.8 N., R.16 E., Calaveras County, Hydrologic Unit 18040012, Eldorado National
Forest, near center of Salt Springs Dam on North Fork Mokelumne River, 1.8 mi upstream from Cole Creek, and 18 mi northeast of West Point.
DRAINAGE AREA.-169 mi2.
PERIOD OF RECORD.-March 1931 to current year. Prior to October 1964, records published as usable contents.
REVISED RECORDS.-WSP 1930: Drainage area.
GAGE.-Water-stage recorder. Prior to Oct. 1, 1991, nonrecording gage read once daily. Datum of gage is sea level (levels by Pacific Gas & Electric Co.).
REMARKS.-Reservoir is formed by concrete-faced rockfill dam, completed in 1931; storage began in March 1931. Capacity, 141,857 acre-ft between elevations
3,667.75 ft, outlet drain, and 3,958.0 ft, top of radial gates. Storage of 1,860 acre-ft available for release to river only. Water is released through Salt
Springs Powerplant (station 11313510) just downstream from dam and discharged into Tiger Creek Powerplant Conduit (station 11314000). Figures given, including
extremes, represent total contents. See schematic diagram of Mokelumne River Basin.
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. Contents not rounded to U.S. Geological Survey standards.
EXTREMES FOR PERIOD OF RECORD.-Maximum contents, 142,091 acre-ft, July 3, 1993, elevation, 3,958.24 ft; no contents at times in 1932-33, 1945, 1962.
EXTREMES FOR CURRENT YEAR.-Maximum contents, 139,446 acre-ft, July 25, elevation, 3,955.48 ft; minimum, 9,669, acre-ft, Jan. 9, elevation, 3,749.51 ft.
Capacity table (elevation, in feet, and contents, in acre-feet)
(Based on table provided by Pacific Gas & Electric Co., dated October 1964)
3,700 1,251 3,720 3,519 3,740 7,324 3,800 28,017
3,705 1,679 3,725 4,324 3,750 9,799 3,850 54,852
3,710 2,199 3,730 5,229 3,760 12,689 3,900 90,786
3,715 2,812 3,735 6,230 3,780 19,632 3,960 143,788
RESERVOIR STORAGE (ACRE-FEET), WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 70137 46252 24407 10105 17635 21059 34027 58353 90454 132989 136812 108796
2 69613 45187 24407 10121 18461 20638 34057 61775 93486 133121 136286 107753
3 69054 44402 24407 10040 20881 20462 34127 e64800 95491 132914 135993 106235
4 68300 43814 24283 10010 21830 20256 34082 68061 96662 132923 135234 105211
5 67302 43219 23648 9910 22541 20001 34037 70251 98403 132905 134372 104278
6 66558 42569 23040 9815 23414 19831 33986 72056 102313 133149 133561 103348
7 66043 41755 22636 9765 23991 19150 33863 73341 107840 133093 132763 102251
8 65778 40740 22113 9688 24309 18424 33696 75075 109823 133262 131951 101300
9 65278 39711 21533 9669 24484 17817 33545 77375 112780 133449 131058 100453
10 64824 38898 20865 9698 24450 17099 33409 79089 114802 133355 130212 99549
11 63996 38208 20012 9866 24330 16380 33314 80187 116605 133036 129382 98599
12 63028 37495 19037 10367 24152 15849 33154 81119 118129 133318 128418 97675
13 62201 36769 18037 10601 23978 15590 32999 81720 120368 134146 127493 96607
14 61463 36003 17309 10725 24071 e15400 32784 82079 123447 134524 126572 95601
15 61268 35095 16417 10725 23999 e15500 32654 82308 126391 134724 125652 94718
16 60689 33986 15504 13385 23750 e15900 32437 82483 129512 135619 124701 93928
17 60107 33014 14696 14516 23460 e16300 32253 82232 131245 136507 123722 93329
18 59244 32234 14137 15011 23248 e16700 32224 82148 133233 137210 122707 92473
19 58197 31474 13559 15435 23131 e17100 32551 82552 133196 137664 121713 91680
20 57416 30713 12975 15721 23003 e17500 33437 83241 133196 137993 120736 90938
21 56752 29968 12382 15825 22887 e17900 35339 83518 133299 138204 119724 e90400
22 56035 28967 11825 15587 22775 e18400 37987 83349 133083 138884 118767 e89900
23 55232 28122 11480 15518 22648 18875 40767 83733 132942 139294 117776 89400
24 54476 27388 11106 15652 22451 26774 42173 84248 133064 139370 116730 88699
25 53483 26801 10942 15738 22186 29848 43100 86364 133327 139446 115759 87998
26 e53300 26628 10792 15814 21955 31274 44071 87051 133121 139209 114740 87371
27 51115 26162 10652 16058 21701 32372 45534 87285 132952 139018 113722 86793
28 49985 25549 10509 16424 21281 33114 47669 87168 133074 138798 112709 86286
29 48877 24986 10337 16946 --- 33563 50505 87223 133327 138377 111758 85858
30 47864 24369 10189 17305 --- 33744 53958 87020 133140 137983 110769 85331
31 47255 --- 10214 17436 --- 33904 --- 87975 --- 137400 109823 ---
MAX 70137 46252 24407 17436 24484 33904 53958 87975 133327 139446 136812 108796
MIN 47255 24369 10189 9669 17635 15400 32224 58353 90454 132905 109823 85331
a 3837.40 3791.72 3751.53 3774.09 3784.23 3812.41 3848.67 3896.44 3948.81 3953.33 3922.90 3993.05
b -23447 -22886 -14155 +7222 +3845 +12623 +20054 +34017 +45165 +4260 -27577 -24492
c 7630 8740 2070 4030 6860 2050 6040 11740 11180 11350 11410 11380
CAL YR 1997 MAX 141568 MIN 10189 b -47951 c 115800
WTR YR 1998 MAX 139446 MIN 9669 b +14629 c 94500
e Estimated.
a Elevation, in feet, at the end of month.
b Change in contents, in acre-feet.
c Release, in acre-feet, through Salt Springs Powerplant, provided by Pacific Gas & Electric Co. USGS Water Resources of California