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, 142,208 acre-ft, June 22, 1999, elevation, 3,958.36 ft; no
contents at times in
1932-33, 1945, 1962.
EXTREMES FOR CURRENT YEAR.-Maximum contents, 142,208 acre-ft, June 22, elevation, 3,958.36 ft; minimum, 7,314
acre-ft, Apr. 9, 11, elevation, 3,739.95 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 1998 TO SEPTEMBER 1999
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 84685 65585 52298 39858 26155 18851 7971 32318 138231 142081 121830 103224
2 84089 65100 51951 39347 25398 18512 7597 33839 138370 142071 120844 102674
3 83461 64519 52016 38739 24609 18724 7329 34783 137371 141984 119881 102060
4 82783 63911 51880 37878 23966 18681 7324 35302 136778 141669 118910 101173
5 82019 63260 51610 37016 23237 18232 7324 36131 137268 141187 117976 100186
6 81330 62708 51423 36094 22675 17686 7324 37946 138546 140607 116982 99380
7 80602 62345 51023 35127 23615 17099 7316 40897 138832 139975 115961 98732
8 79971 62002 50756 34247 24310 16633 7316 43763 138463 139657 115066 98247
9 79262 61500 50260 33428 25816 16237 7314 46165 138398 138999 114635 97778
10 78601 60918 49778 32581 26261 15579 7324 48247 138943 138416 114343 e96730
11 77955 60368 49310 31922 25943 14940 7314 51005 139512 137849 113840 96229
12 77263 59789 48862 31157 25897 14314 7316 54707 139782 137315 113497 95072
13 76630 59200 48461 29988 24953 13685 7316 58621 140023 136787 113078 94309
14 76645 58607 48043 29196 24404 13202 7392 60951 139965 136360 112278 93711
15 76129 57972 47775 28474 23796 12644 8230 63042 139763 135768 111478 93096
16 75545 57383 47361 27923 23307 12056 9282 65044 139580 135055 111059 92498
17 74956 56851 46931 27533 23771 11491 10722 67718 e139460 134297 110757 91826
18 74077 56228 46526 27883 23665 11077 12583 69774 140740 133561 110417 90933
19 73261 55525 46081 28946 23208 10792 14759 74397 140100 132831 110098 89998
20 72639 54914 45824 29965 22848 10496 17020 77955 140883 132092 109766 89388
21 72354 54246 45484 30152 23038 10062 19216 82095 142188 131327 109202 88847
22 71712 53802 44991 29965 22926 9663 20845 87174 142208 130533 108534 88329
23 71115 53711 44496 30049 22290 9305 21925 93186 140883 129672 108050 87848
24 70595 53545 43987 29908 21657 9017 22828 98847 140892 128848 107566 87259
25 70010 53113 43463 30175 21041 8752 24093 105908 141385 128000 107129 86385
26 69128 52608 42939 29862 20547 8686 26296 112278 141385 127149 106770 85498
27 68575 52063 42452 29327 19944 8750 26627 118786 141357 126266 106341 84825
28 68036 51487 41949 28556 19382 8691 25533 124936 141650 125350 105638 84236
29 67468 51111 41429 27872 --- 8539 30515 129595 141896 124486 104871 83655
30 66871 52093 40881 27246 --- 8335 31342 133534 142139 123626 104319 83080
31 66250 --- 40326 26830 --- 8208 --- 136579 --- 122732 103858 ---
MAX 84685 65585 52298 39858 26261 18851 31342 136579 142208 142081 121830 103224
MIN 66250 51111 40326 26830 19382 8208 7314 32318 136778 122732 103858 83080
a 3867.13 3845.55 3824.91 3797.36 3779.34 3743.73 3806.70 3852.42 3858.29 3837.43 3815.82 3790.13
b -19081 -14157 -11767 -13496 -7448 -11174 +23134 +105237 +5560 -19407 -18874 -20778
c 10870 11240 11660 1190 0 0 2030 14040 13490 14340 12230 8550
CAL YR 1998 MAX 139446 MIN 9669 b +30112 c 109800
WTR YR 1999 MAX 142208 MIN 7314 b -2251 c 99640
e Estimated.
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