10296000  WEST WALKER RIVER BELOW LITTLE WALKER RIVER, NEAR COLEVILLE, CA

LOCATION.-Lat 38°22'47", long 119°26'57", in NE 1/4 SE 1/4 sec.9, T.6 N., R.23 E., Mono County, Hydrologic Unit 16050302, in Toiyabe 
  National Forest, on left bank, 200 ft downstream from Little Walker River, 10 ft upstream from bridge on U.S. Highway 395, and 13 mi 
  southeast of Coleville.
DRAINAGE AREA.-181 mi2.
PERIOD OF RECORD.-April 1938 to current year.  Prior to October 1958, published as "below East Fork."
REVISED RECORDS.-WDR NV-79-1:  Drainage area.
GAGE.-Water-stage recorder.  Datum of gage is 6,591.39 ft above sea level.  Prior to Oct. 1, 1939, at site, 125 ft downstream at datum 1.00 ft 
  higher.  Oct. 1, 1939, to Sept. 30, 1969, at present site and datum.  Oct. 1, 1969, to July 10, 1987, at site 100 ft downstream at same datum. 
  July 10, 1987, to Mar. 5, 1997, at site upstream 100 ft at same datum.  Mar. 6, 1987, at site 150 ft downstream at datum 2.00 ft lower.
REMARKS.-Records fair except for estimated daily discharges, which are poor.  Station is above diversions except for a few small ranch ditches.  
  Flow slightly regulated by Poore Lake, capacity, 1,200 acre-ft, 7 mi upstream.  These data are reviewed and provided by the Nevada District 
  Office, U.S. Geological Survey.
EXTREMES OUTSIDE PERIOD OF RECORD.-Maximum discharge observed prior to 1938, 5,800 ft3/s, Dec. 11, 1937, on basis of slope-area 
  measurement of peak flow.  

                  DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997

                                               DAILY MEAN VALUES
 DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
   1        52       54       89     1630      162     e160      473      858     2050      573      252       89
   2        58       53       76     8660      152      163      424      839     1740      539      235      105
   3        55       53       93     3760      144     e170      406      866     1690      560      216      122
   4        52       54       98     1750      133      168      375     1040     1740      630      219      109
   5        50       45      167     1230     e130     e165      357     1160     1570      665      215      103
 
   6        49       45      114      930     e132     e160      341     1240     1330      653      215       98
   7        48       50      107      797     e132      159      331     1320     1380      650      209       93
   8        47       53      105      681     e132      169      338     1350     1480      706      201       89
   9        47       54      103      600     e130      177      337     1470     1420      710      198       86
  10        46       54       91      530     e130      197      322     1650     1230      746      188       83
 
  11        45       54      115      479     e134      221      313     1710     1210      707      170       81
  12        45       55      156      432     e135      227      309     1800     1200      618      158       81
  13        45       53      161      411     e130      225      312     1920     1090      553      152       79
  14        45       52      133      392     e132      242      348     1940     1120      566      149       76
  15        45       48      123      374     e136      274      417     1820     1060      597      141       75
 
  16        44       44      119      321      139      294      531     1880     1210      554      138       75
  17        44      125      108      297      146      283      640     1950     1370      483      135       72
  18        47      168      105      276      144      291      690     1750     1510      451      137       68
  19        50      141      108      260      150      327      791     1730     1490      407      134       69
  20        46      119       96      245      156      378      914     1750     1480      412      131       70
 
  21        43      116       72      233      154      379     1110     1490     1370      446      134       69
  22        47      193       65      228      159      377     1090     1330     1200      509      124       67
  23        48      143       85      220      156      418      912     1200     1020      428      120       66
  24        49      128      120      224     e165      463      777     1010      929      440      120       65
  25        54      115      120      279      203      495      703      895      929      418      122       70
 
  26        51      107      130      246      161      553      794      866      941      360      114       73
  27        54       89      117      225      161      607     1030      979      941      345      107       67
  28        51       96      106      204      160      602     1090     1270      859      336      101       65
  29        54       87      138      196      ---      583      915     1490      786      307       98       62
  30        56       82      204      182      ---      563      877     1810      718      297       93       59
  31        57      ---      271      171      ---      534      ---     2050      ---      282       90      ---
 
 TOTAL    1524     2530     3695    26463     4098    10024    18267    44433    38063    15948     4816     2386
 MEAN     49.2     84.3      119      854      146      323      609     1433     1269      514      155     79.5
 MAX        58      193      271     8660      203      607     1110     2050     2050      746      252      122
 MIN        43       44       65      171      130      159      309      839      718      282       90       59
 AC-FT    3020     5020     7330    52490     8130    19880    36230    88130    75500    31630     9550     4730
 
 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1938 - 1997, BY WATER YEAR (WY)                                 
 
 MEAN     55.3     68.8     72.9     80.4     76.3      109      300      770      946      490      152     74.1
 MAX       219      539      448      854      246      369      609     1655     2066     1864      663      246
 (WY)     1983     1951     1951     1997     1963     1986     1997     1969     1983     1995     1983     1983
 MIN      16.6     22.2     20.0     18.1     26.0     32.1      108      139      189     41.1     18.5     12.4
 (WY)     1978     1978     1991     1977     1991     1977     1975     1977     1976     1977     1977     1977
 
 SUMMARY STATISTICS           FOR 1996 CALENDAR YEAR        FOR 1997 WATER YEAR           WATER YEARS 1938 - 1997
 
 ANNUAL TOTAL                      129640                     172247                                             
 ANNUAL MEAN                          354                        472                        264                  
 HIGHEST ANNUAL MEAN                                                                        537              1983
 LOWEST ANNUAL MEAN                                                                          65.3            1977
   HIGHEST DAILY MEAN                  3450     May 16            8660     Jan  2            8660       Jan  2 1997
   LOWEST DAILY MEAN                     43     Oct 21              43     Oct 21               9.7     Sep 11 1977
   ANNUAL SEVEN-DAY MINIMUM              45     Oct 11              45     Oct 11              10       Sep  5 1977
   INSTANTANEOUS PEAK FLOW                                       12300     Jan  2           12300       Jan  2 1997
   INSTANTANEOUS PEAK STAGE                                         10.11  Jan  2              10.11    Jan  2 1997
 ANNUAL RUNOFF (AC-FT)             257100                     341700                     191000                  
 10 PERCENT EXCEEDS                   975                       1320                        810                  
 50 PERCENT EXCEEDS                   152                        198                         89                  
 90 PERCENT EXCEEDS                    53                         54                         34                  
 
   e  Estimated.