11277200 CHERRY LAKE NEAR HETCH HETCHY, CA
LOCATION.-Lat 37°58'33", long 119°54'47", in SE 1/4 NW 1/4 sec.5, T.1 N., R.19 E., Tuolumne County,
Hydrologic Unit 18040009, Stanislaus National Forest, on upstream face of Cherry Valley Dam on Cherry Creek, 4.2
mi upstream from Eleanor Creek, 7 mi north of Early Intake, and 7.3 mi northwest of Hetch Hetchy.
DRAINAGE AREA.-117 mi2.
PERIOD OF RECORD.-August 1956 to current year. Prior to October 1959, published as Lake Lloyd near Hetch Hetchy.
GAGE.-Water-stage recorder. Datum of gage is 2.42 ft above sea level. Prior to October 1974, datum published as
at mean sea level.
REMARKS.-Reservoir is formed by a rockfill dam completed in 1956. Storage began in December 1955. Capacity,
274,300 acre-ft between gage heights 4,430 ft, bottom of sluice gates, and 4,703 ft, top of flashboard gates on
concrete spillway. No dead storage. Installation of flashboard gates on top of concrete spillway completed in
1979. Water is released down Cherry Creek for power development and domestic supply as part of Hetch Hetchy
system of city and county of San Francisco. Unmeasured diversion from Lake Eleanor (station 11277500) into Cherry
Lake began Mar. 6, 1960. Diversion from Cherry Lake through tunnel to Dion R. Holm Powerplant near mouth of
Cherry Creek began Aug. 1, 1960. See schematic diagram of Tuolumne River Basin. Records, including extremes,
represent contents at 2400 hours.
EXTREMES FOR PERIOD OF RECORD.-Maximum contents, 274,300 acre-ft, June 25-28, 1986, gage height, 4,703.0 ft;
minimum since reservoir first filled, 7,660 acre-ft, Jan. 24, 1960, gage height, 4,502.1 ft. Reservoir drained
for inspection in 1961, 1964, and 1989.
EXTREMES FOR CURRENT YEAR.-Maximum contents, 273,900 acre-ft, June 15, gage height, 4,702.79 ft; minimum, 192,700
acre-ft, Apr. 14, 15, gage height, 4,654.70 ft, Apr. 14.
Capacity table (gage height, in feet, and contents, in acre-feet)
(Based on table provided by San Francisco Public Utilities Commission, dated May 15, 1971)
4,440 0 4,490 3,020 4,560 60,800 4,660 201,100
4,450 75 4,500 6,030 4,580 85,100 4,680 234,100
4,460 250 4,510 11,700 4,600 111,800 4,700 268,800
4,470 675 4,520 19,700 4,620 139,900 4,705 277,900
4,480 1,530 4,540 38,900 4,640 169,700
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 249000 252100 254300 244200 240400 223900 202400 199000 260500 272000 268300 243500
2 248400 251500 253700 243800 239600 223100 201600 199400 261900 272400 267200 242400
3 248200 250700 253200 243500 239000 222600 200800 199400 262300 272400 266200 241300
4 248800 249900 252300 243700 238300 221900 199900 199000 261800 272200 265200 240800
5 248800 249200 251400 243900 237500 221000 199100 198900 261900 271800 264200 240500
6 248900 248700 250900 244000 236600 220300 198300 199900 262600 271200 263000 240000
7 248900 249400 249900 244100 238300 219400 197400 201700 263700 270700 262500 239000
8 248900 249700 249500 244300 239200 218500 196700 203700 264300 270200 262500 238100
9 249100 249400 248900 244500 240400 217400 195800 205600 265100 270100 261600 237400
10 249700 249400 248000 244600 239800 216500 194900 206900 266100 270200 260700 236600
11 249900 249200 247600 244600 239000 215500 194100 208500 267500 270600 259700 236200
12 249800 249000 247400 244900 238300 214600 193300 211100 269100 270600 258700 236100
13 249700 248900 247600 244900 237600 213700 192800 213600 270600 270600 257600 235800
14 249700 249700 247400 244900 236500 212900 192700 215000 272300 270200 256400 235300
15 249700 250200 247100 245300 235600 212000 192700 215800 273900 270400 256300 235100
16 249700 250100 246900 245700 234700 211100 192800 216600 273700 270600 255400 234800
17 250400 250100 246800 245900 234300 210300 193200 218100 273600 270700 254400 234300
18 250900 250000 246900 246800 233600 209700 193700 220300 273400 271200 253200 234000
19 251400 249800 247400 248600 232700 209100 194500 222200 273400 271200 251700 233900
20 251700 249900 247600 249800 231800 208600 195400 224200 273500 271100 250200 233800
21 251800 250100 247500 249700 230700 208100 196200 226800 273400 271000 249400 233700
22 251700 250800 247400 248900 229900 207500 196700 230400 273500 270800 249400 233700
23 251300 251400 247300 249200 229000 207000 196900 234700 273700 270600 248800 233500
24 251300 251800 247200 248600 228100 206200 196800 238300 273500 270700 248700 233000
25 251600 251700 247200 248000 227300 205500 197100 242200 273200 271100 248600 233000
26 251600 252000 247300 247000 226400 205100 197800 245600 272800 270800 248000 232800
27 251500 251800 247400 246100 225400 204800 198700 248800 272200 270300 247400 232700
28 251400 251500 247200 245200 224600 204800 199000 252000 271700 269800 246600 232300
29 251600 251700 246500 244700 --- 204400 198800 254600 271600 269300 246500 231900
30 251500 254400 245700 243300 --- 203800 198700 256800 271700 268800 245600 231300
31 251800 --- 244700 241900 --- 203200 --- 258700 --- 268300 244500 ---
MAX 251800 254400 254300 249800 240400 223900 202400 258700 273900 272400 268300 243500
MIN 248200 248700 244700 241900 224600 203200 192700 198900 260500 268300 244500 231300
a 4690.35 4691.82 4686.21 4684.57 4674.34 4661.29 4658.48 4694.24 4701.59 4699.71 4686.08 4678.35
b +2700 +2600 -9700 -2800 -17300 -21400 -4500 +60000 +13000 -3400 -23800 -13200
CAL YR 1998 b +87000
WTR YR 1999 b -17800
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