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, 1997, 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. 
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 12,300 ft3/s, Jan. 2, 1997, gage height, 10.11 ft; minimum daily, 9.7 ft3/s, Sept. 11, 1997.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharges of 1,120 ft3/s and maximum (*):
  Date		Time	Discharge
  (ft3/s)	Gage height
  (ft)		Date		Time	Discharge
  (ft3/s)
  	June 22			0145		*2,590		*5.61			No other peak greater than base discharge.			

                  DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998

                                               DAILY MEAN VALUES
 DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
   1        58       54       59       47       57       72      206     1010      946     1840      594      182
   2        61       53       52       43       63       73      189      993     1150     1850      586      180
   3        64       52       60       38       72       72      183      909     1050     1940      588      195
   4        62       52       55       38       66       71      173      908      973     1860      573      205
   5        61       51       51       64       82       72      168      866     1050     1840      577      207
   6        60       52       59       50       57       70      164      764     1300     1900      598      216
   7        63       54       58      e49       51       74      159      661     1600     2030      598      205
   8        62       48       52       48      e58       68      156      720     1560     2140      544      179
   9        69       48       51       47       63       66      161      807     1400     2220      445      306
  10        70       55      e52       43      e59       69      166      677     1540     2060      408      283
 
  11        72       57      e53       42       58       71      165      623     1300     1800      405      202
  12        68       50      e54       46      e56       74      157      587     1530     1580      411      187
  13        70       52      e54       64      e55       75      151      511     1550     1590      407      165
  14        71       50      e55       46       54       77      148      459     1830     1470      425      153
  15        68       46       57       79      e55       84      143      470     2100     1300      405      147
  16        66       49       56       87      e55      101      142      525     2340     1340      392      140
  17        64       52       51       90      e54      116      144      450     2130     1530      353      134
  18        64       49       46       78      e54      126      160      427     1900     1620      309      129
  19        62       57       43       66       55      131      196      483     2090     1490      281      124
  20        61       53       47       84       60      153      260      548     2050     1490      260      119
 
  21        61       52       48       84       51      175      378      539     2180     1520      236      115
  22        60       54      e48       67       57      295      568      499     2280     1490      220      111
  23        58       55      e47       63       56      668      670      567     2070     1270      203      107
  24        57       51      e47       56      e59      652      540      568     1860     1300      191      111
  25        53       52      e46       65      e62      486      473      800     2110     1080      183      115
  26        55       67       47       52      e67      395      429      701     2130      933      184      128
  27        54       58       53       50      e70      354      473      564     1860      874      179      148
  28        53      e58       57       51       72      304      573      564     1890      862      175      139
  29        55      e59       55       50      ---      261      710      630     2010      853      176      176
  30        54       60       53       81      ---      241      894      573     2050      818      188      182
  31        53      ---       51       57      ---      224      ---      694      ---      673      202      ---
 
 TOTAL    1909     1600     1617     1825     1678     5770     9099    20097    51829    46563    11296     4990
 MEAN     61.6     53.3     52.2     58.9     59.9      186      303      648     1728     1502      364      166
 MAX        72       67       60       90       82      668      894     1010     2340     2220      598      306
 MIN        53       46       43       38       51       66      142      427      946      673      175      107
 AC-FT    3790     3170     3210     3620     3330    11440    18050    39860   102800    92360    22410     9900
 
 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1938 - 1998, BY WATER YEAR (WY)                                 
 
 MEAN     55.4     68.6     72.6     80.1     76.0      111      300      768      959      506      155     75.6
 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 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1938 - 1998
 
 ANNUAL TOTAL                      169624                     158273                                             
 ANNUAL MEAN                          465                        434                        266                  
 HIGHEST ANNUAL MEAN                                                                        537              1983
 LOWEST ANNUAL MEAN                                                                          65.3            1977
   HIGHEST DAILY MEAN                  8660     Jan  2            2340     Jun 16            8660       Jan  2 1997
   LOWEST DAILY MEAN                     43     Dec 19              38     Jan  3               9.7     Sep 11 1977
   ANNUAL SEVEN-DAY MINIMUM              47     Dec 18              46     Dec 29              10       Sep  5 1977
   INSTANTANEOUS PEAK FLOW                                        2590     Jun 22           12300       Jan  2 1997
   INSTANTANEOUS PEAK STAGE                                          5.61  Jun 22              10.11    Jan  2 1997
 ANNUAL RUNOFF (AC-FT)             336400                     313900                     193000                  
 10 PERCENT EXCEEDS                  1320                       1530                        817                  
 50 PERCENT EXCEEDS                   196                        142                         90                  
 90 PERCENT EXCEEDS                    53                         51                         34                  
 
   e  Estimated.