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, 273,500 acre-ft, June 18, 19, gage height, 4,702.60 ft, June 19; minimum, 
  160,600 acre-ft, Sept. 30, gage height, 4,633.99 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 1996 TO SEPTEMBER 1997

                                        DAILY OBSERVATION AT 2400 HOURS
DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

  1    212900   191200   182000   212800   241200   199700   185800   192600   256400   272400   237200   201500
  2    212200   190200   180700   255800   240000   198100   184800   193200   258700   271800   235900   200300
  3    211600   189600   179300   265700   238700   196600   183700   193900   260300   270900   234900   199100
  4    210900   189100   178100   269800   237200   194700   182600   195100   264400   270600   233500   198000
  5    210200   188500   178700   270100   235800   193300   181700   196700   267200   270100   232100   196600

  6    209600   187800   178100   269800   234400   191900   180900   198300   267900   270300   230800   195100
  7    209000   187100   177100   269600   232900   190600   180000   200000   268600   269700   229500   193600
  8    208500   186500   176200   269300   231500   189800   179400   202000   269600   268800   228200   192000
  9    207800   186000   175400   268500   230000   188800   178600   204200   270200   268000   227400   190400
 10    207100   185400   175200   268000   228500   188300   177700   206600   270800   267200   226500   188800

 11    206300   184800   176400   267300   227000   187700   176800   210000   271300   266300   225000   187000
 12    205700   184300   180600   266300   225400   187200   176100   212600   272000   265800   223700   185500
 13    205100   183700   181600   265100   223900   186400   175700   215500   272100   265200   222400   184100
 14    204500   183100   181600   263800   222400   186000   175400   218000   272400   264100   221100   182600
 15    203600   182500   181400   262500   221000   185600   175600   220400   272600   262700   219800   181000

 16    202800   181900   181000   260900   219500   185600   176200   223000   273000   261500   219000   179400
 17    201900   184200   180500   259700   218200   185000   177000   225900   273300   260200   218200   177800
 18    201100   188200   179900   258300   216700   184600   177900   228900   273500   258800   217000   176200
 19    200300   189000   179300   257000   215300   184400   181200   231000   273500   257400   215800   174600
 20    200200   189400   178700   255800   214000   184400   182800   232900   273400   255900   214500   172800

 21    199300   190400   178500   254600   212500   184100   184700   234800   273200   254300   213200   171200
 22    198700   192500   178500   253800   211000   183600   186000   236300   273200   252800   212000   169300
 23    197900   191800   178000   252300   209500   183900   186700   238000   272800   251200   211200   167800
 24    197300   191000   177500   250100   207800   184100   186900   239400   272500   249700   210400   166200
 25    196400   189700   176800   250100   206100   184700   187200   240700   272300   248200   209100   164800

 26    195900   188800   176800   248500   204600   185200   188300   242000   272100   246600   207900   163700
 27    195400   187900   176900   246700   203000   186100   189900   242800   272000   245100   206600   163200
 28    194800   186300   176400   245700   201200   186400   191300   244800   272800   243600   205300   162700
 29    193900   184900   177200   244700      ---   186600   191800   247100   273400   242000   204000   161500
 30    192900   183300   180600   243500      ---   186600   192100   249600   273100   240400   203200   160600
 31    192100      ---   185200   242400      ---   186500      ---   253100      ---   238800   202400      ---

MAX    212900   192500   185200   270100   241200   199700   192100   253100   273500   272400   237200   201500
MIN    192100   181900   175200   212800   201200   183600   175400   192600   256400   238800   202400   160600
 a    4654.32  4648.76  4650.02  4684.84  4660.07  4650.85  4654.35  4691.06  4702.34  4682.73  4660.80  4633.99
 b     -21600    -8800    +1900   +57200   -41200   -14700    +5600   +61000   +20000   -34300   -36400   -41800

CAL YR 1996 b -61900
WTR YR 1997 b -53100