10297000  TOPAZ LAKE NEAR TOPAZ, CA

LOCATION.-Lat 38°41'35", long 119°31'10", in NW 1/4 NE 1/4 sec.33, T.10 N., R.22 E., Douglas County, Hydrologic Unit 16050301, at outlet works of Topaz Lake on West Walker River, and 5.5 mi north of Topaz.
PERIOD OF RECORD.-December 1921 to September 1931 (monthly contents only published in WSP 1734), October 1931 to current year.
GAGE.-Water-stage recorder.  Datum of gage is above sea level.  Prior to October 1, 1978, at datum 4.62 ft higher.
REMARKS.-Topaz Lake, formerly known as Alkali Lake and Topaz Reservoir, was formed by the diversion of water from West Walker River through a feeder canal and the construction of an outlet tunnel through a low saddle in rim of lake.  Storage began about December 1921.  Usable capacity, 59,440 acre-ft, between elevations 4,967.68 ft (lowest practical elevation for diversion through tunnel) and 5,000.38 ft (3 ft below top of levee).  Usable capacity of reservoir was increased from about 45,000 acre-ft to 59,440 acre-ft in October 1937 by an earthfill, rock-faced levee at south end.  Figures given herein represent usable contents.  There is 65,000 acre-ft of lake volume below the point of controllable storage.  Water is used for irrigation in Walker River Irrigation District.  These data are reviewed and provided by the Nevada District Office, U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD.-Maximum contents, 60,680 acre-ft, July 3, 1980, July 10, 1995, elevation 5,000.92 ft, present datum; no usable contents at times in some years.
EXTREMES FOR CURRENT YEAR.-Maximum contents 60,010 acre-ft, Aug. 5, elevation, 5,000.63 ft; minimum contents, 12,490 acre-ft, Oct. 31, elevation 4,975.60 ft.
  Capacity table, (elevation, in feet, and contents, in acre-feet)					
	4,968		490		4,980		19,760		4,995		47,540
	4,970		3,580		4,985		28,310		5,000		58,570
	4,975		11,520		4,990		37,360		5,001		60,870

                   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     15560    12600    16270    20190    25290    31760    42490    34620    22630    51370    59550    43310
   2     15450    12680    16400    20310    25590    31920    42900    34510    22680    52910    59550    42880
   3     15230    12760    16520    20460    25910    32120    43230    34380    22700    54460    59780    42240
   4     15050    12860    16650    20540    26190    32260    43600    34270    22680    55160    59780    41680
   5     14840    12980    16840    20650    26400    32420    43910    34310    22700    55830    60010    41150
 
   6     14640    13070    16970    20730    26660    32660    44220    34250    22970    56500    59780    40650
   7     14490    13190    17170    20880    26950    32780    44470    34000    23620    56960    59550    40270
   8     14270    13300    17300    21020    27250    32980    44700    33780    24330    57410    59350    39910
   9     14220    13400    17430    21150    27490    33140    44820    33620    24800    57860    58890    39670
  10     14130    13510    17530    21290    27720    33310    44900    33330    25450    58090    58430    39570
 
  11     14050    13630    17630    21390    27980    33490    44800    32980    25840    58340    57750    39490
  12     14000    13740    17750    21590    28200    33670    44410    32590    26380    58570    56840    39410
  13     13970    13870    17800    21760    28430    33850    43970    32170    26880    59030    56170    39350
  14     13890    13990    17980    21910    28740    34010    43520    31670    27610    59030    55490    39370
  15     13770    14070    18130    22080    28970    34200    43040    31140    28590    59030    54840    39370
 
  16     13690    14180    18250    22270    29200    34400    42570    30710    29740    59030    54170    39350
  17     13630    14280    18380    22490    29410    34640    42020    30240    30850    59260    53730    39230
  18     13550    14410    18530    22800    29600    34870    41430    29720    31550    59280    53060    39150
  19     13480    14480    18630    23040    29830    35110    40770    29180    32600    59280    52620    39030
  20     13400    14610    18750    23220    29990    35370    40190    28590    33760    59280    52180    38840
 
  21     13250    14760    18850    23390    30270    35630    39630    27980    34970    59280    51740    38640
  22     13110    14950    18970    23560    30450    36070    39090    27320    36290    59050    51110    38370
  23     12980    15000    19070    23730    30680    36750    38560    26730    37690    58820    50460    38060
  24     12810    15120    19200    23920    30840    38040    37980    26140    39050    58820    49590    37770
  25     12700    15280    19300    24010    31010    38940    37320    25740    40850    58620    48730    37480
 
  26     12650    15530    19420    24280    31210    39590    36650    25310    42800    58840    47790    37320
  27     12620    15700    19520    24440    31390    40180    36010    24800    44430    59300    46880    37170
  28     12620    15830    19640    24610    31600    40690    35430    24280    46040    59530    46040    37070
  29     12570    15980    19750    24780      ---    41170    35020    23770    47810    59530    45260    37000
  30     12570    16120    19890    24930      ---    41590    34730    23270    49630    59530    44550    37070
  31     12550      ---    19990    25110      ---    42040      ---    22850      ---    59530    43890      ---
 
 MAX     15560    16120    19990    25110    31600    42040    44900    34620    49630    59530    60010    43310
 MIN     12550    12600    16270    20190    25290    31760    34730    22850    22630    51370    43890    37000
   a   4975.64  4977.82  4980.04  4983.15  4986.86  4992.36  4988.60  4981.83  4995.98  5000.42  4993.26  4989.85
   b     -3210    +3570    +3870    +5120    +6490   +10440    -7310   -11880   +26780    +9900   -15640    -6820
 CAL YR 1997   MAX 59190  MIN 12550  b -15960
 WTR YR 1998   MAX 60010  MIN 12550  b +21310
    a  Elevation, in feet above sea level, at end of month.
    b  Change in contents, in acre-feet.