2000 California Hydrologic Data Report
a Gage height, in feet, at end of month.
b Change in contents, in acre-feet.
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 mi".
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. Records,
including extremes, represent contents at 2400 hours. See schematic diagram of Tuolumne River Basin.
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, 274,000 acre-ft, June 14, gage height, 4,702.83 ft; minimum,
118,400 acre-ft, Sept. 30, gage height, 4,604.72 ft. 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 1999 TO SEPTEMBER 2000
DAILY OBSERVATION AT 2400 HOURS
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 230100 216600 218900 218500 237100 227100 207800 226400 269300 266000 211900 164500
2 229700 216400 219000 218500 236500 226000 208300 227700 270100 265200 210700 163700
3 229600 215900 219100 218400 236100 224900 208900 229200 271100 263900 209100 162700
4 228700 215800 219000 218200 235900 223900 210200 230700 272300 262400 207700 e162000
5 227900 215700 218900 218300 236100 223000 211700 232300 273200 260900 206300 e160000
6 227400 215600 218800 218200 236300 221900 212500 233200 273700 259900 204900 e158000
7 226800 215800 218700 218000 236200 220800 213200 235000 273900 258300 203300 e156000
8 226100 216100 218700 218100 236400 219800 214100 240000 273800 256600 201500 154000
9 225700 216000 218800 217900 237400 218600 215000 241700 272900 254900 199700 152500
10 225600 216100 218700 218000 238500 217500 215400 242000 272400 253100 197900 150900
11 225100 216100 218600 218100 238700 216400 215900 241500 272200 251200 196100 149500
12 224200 216100 218700 218100 239400 215500 216600 241000 272500 249400 194400 148300
13 223200 216100 218900 218200 240000 214700 219800 240900 273300 247500 193100 146700
14 222300 216100 218700 218200 242100 214100 220700 240800 274000 245700 191500 145000
15 221700 216200 218700 218400 241700 213600 220600 240800 273600 243800 190000 143300
16 221600 216300 218700 218700 241000 213100 220300 240900 273500 242000 188200 141900
17 221300 216800 218700 219600 240000 212600 220700 240600 273600 240000 186400 140300
18 221100 217000 218700 223100 238900 212200 220300 240800 273500 238000 184500 138700
19 221100 217500 218600 224200 237800 212000 219800 242100 273300 236200 182700 136900
20 221000 218200 218700 226100 237100 211500 219400 244100 273100 234300 181000 135200
21 220400 218600 218800 227700 235900 210900 219300 246500 272800 232400 179200 133500
22 219800 218600 218800 228600 234800 210300 219200 249200 272500 230500 177300 131700
23 219700 218600 218700 230000 233900 209800 219100 251400 272000 228700 175500 129700
24 219600 218700 218500 234700 232700 209300 219300 254400 271300 226800 173600 127700
25 218800 218600 218500 236400 231500 209000 219700 258200 270400 224800 172000 125700
26 218400 218700 218500 236400 230400 208900 220700 260800 269600 222900 170700 123700
27 218000 218500 218500 236300 230300 208900 222200 262900 269100 221000 169600 121700
28 218000 218600 218600 235900 229200 208800 223600 265000 268000 219100 168500 119700
29 217500 218700 218500 235900 228100 208500 224200 266700 267300 217200 167800 118600
30 217300 218700 218500 236800 --- 208300 225100 268100 266800 215400 167300 118400
31 217200 --- 218400 237500 --- 207800 --- 268800 --- 213500 166200 ---
MAX 230100 218700 219100 237500 242100 227100 225100 268800 274000 266000 211900 164500
MIN 217200 215600 218400 217900 228100 207800 207800 226400 266800 213500 166200 118400
a 4669.92 4670.80 4670.64 4681.97 4676.45 4664.14 4674.65 4699.98 4698.83 4667.63 4637.66 4604.72
b -14100 +1500 -300 +19100 -9400 -20300 +17300 +43700 -2000 -53300 -47300 -47800
CAL YR 1999 b -26300
WTR YR 2000 b -112900
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