10296500  WEST WALKER RIVER NEAR COLEVILLE, CA

LOCATION.-Lat 38°30'55", long 119°27'15", in NW 1/4 NE 1/4 sec.28, T.8 N., R.23 E., Mono County, Hydrologic Unit 16050302, in Toiyabe National Forest, on left bank, 0.4 mi downstream from Rock Creek, and 5 mi southeast of Coleville.
DRAINAGE AREA.-250 mi2.
PERIOD OF RECORD.-October 1902 to July 1908 (published as West Fork of Walker River near Coleville, 1903, 1905-8 and as Walker River (West Fork) near Coleville, 1904), March 1909 to September 1910, June 1915 to March 1938, May 1957 to current year.
REVISED RECORDS.-WSP 880:  1917 (runoff in acre-ft). WSP 1514:  1918, 1923. WDR NV-80-1:  Drainage area.
GAGE.-Water-stage recorder. Elevation of gage is 5,520 ft above sea level, from topographic map. See WSP 1927 for history of changes prior to July 25, 1964. July 26, 1964, to Jan. 2, 1997 (gage destroyed in '97 flood), at several sites and datums 2,000 ft downstream from present location, when re-established Oct. 28, 1997, at new datum.
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, 17 mi upstream. These data are reviewed and provided by the Nevada District Office, U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 12,500 ft3/s, Jan. 2, 1997, gage height, 10.23 ft; minimum daily, 14 ft3/s, several days July-September 1924 and Sept. 12, 1977.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 1,120 ft3/s and maximum (*):
  Date	Time	Discharge
  (ft3/s)	Gage height
  (ft)		Date	Time	Discharge
  (ft3/s)	Gage height
  (ft)
  	May 1		0045		1,330		7.20			June 22		0045		*2,730		*8.81

                  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       e70       63       67      e47      e64       77      246     1150      994     1910      624      181
   2       e75       62       60      e44      e72       81      221     1130     1200     1900      611      178
   3       e78       62       55      e40      e83       82      214     1020      987     1980      614      183
   4       e74       62       63      e40      e79       78      200     1000      909     1870      606      220
   5       e70       61       59      e71      e90       78      194      968      981     1840      606      212
 
   6       e70       61       67      e56      e79       82      190      844     1180     1860      623      220
   7       e73       64       68      e58       78       71      182      723     1560     1990      623      212
   8       e75       59       62      e50       74       80      178      784     1610     2080      577      184
   9       e85       58       57      e48       84       75      179      884     1440     2080      474      277
  10       e86       64       53      e43       81       77      186      749     1620     1940      425      300
 
  11       e86       67       57      e42       83       81      186      686     1330     1750      416      209
  12       e81       61       52      e50       81       84      175      639     1560     1520      416      193
  13       e85       62       59      e70       81       85      166      547     1560     1530      415      170
  14       e81       61       62      e56       85       87      162      474     1820     1490      435      158
  15       e83       57       61      e88       78       92      154      468     2020     1440      423      152
  
  16       e80       55       61      e90       74      105      153      534     2380     1440      403      145
  17       e78       61       63      e92       83      121      150      464     2180     1560      361      139
  18       e77       58       63      e82       77      133      165      434     1880     1630      323      134
  19       e73       64       57      e77       81      138      201      490     2150     1490      296      129
  20       e74       62       58      e90       76      159      271      564     2080     1430      273      124
 
  21       e75       61       52      e88       77      184      405      557     2250     1470      248      120
  22       e73       62      e61      e79       76      289      627      508     2330     1460      228      117
  23       e71       63      e66      e72       81      676      776      590     2110     1250      210      113
  24       e69       59      e66      e62       69      655      611      570     1840     1270      197      116
  25       e62       60      e59      e70       79      582      537      835     2130     1110      186      123
 
  26       e66       77      e50      e58       78      478      474      756     2100      958      183      132
  27       e65       66      e55      e52       77      433      518      593     1930      895      180      154
  28       e63       64      e61      e53       77      371      621      572     1950      875      175      144
  29        66       68      e57      e63      ---      312      783      653     2090      865      175      171
  30        65       68      e56      e88      ---      283      991      581     2110      845      183      182
  31        64      ---      e53      e70      ---      268      ---      709      ---      714      197      ---
 
 TOTAL    2293     1872     1840     1989     2197     6397    10116    21476    52281    46442    11706     5092
 MEAN     74.0     62.4     59.4     64.2     78.5      206      337      693     1743     1498      378      170
 MAX        86       77       68       92       90      676      991     1150     2380     2080      624      300
 MIN        62       55       50       40       64       71      150      434      909      714      175      113
 AC-FT    4550     3710     3650     3950     4360    12690    20070    42600   103700    92120    23220    10100
  
 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1903 - 1998, BY WATER YEAR (WY)                                 
  
 MEAN     70.5     71.2     68.1     79.9     82.2      128      306      784      997      539      170     85.0
 MAX       299      214      270      905      280      403      636     1756     2055     2492      721      269
 (WY)     1905     1974     1965     1997     1963     1986     1910     1969     1983     1907     1995     1907
 MIN      21.5     25.4     28.7     26.9     32.0     42.1      118      149      106     26.9     17.4     16.1
 (WY)     1978     1930     1960     1930     1929     1933     1975     1977     1924     1924     1924     1924
  
 SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1903 - 1998
  
 ANNUAL TOTAL                      176413                     163701                                             
 ANNUAL MEAN                          483                        448                        281                  
 HIGHEST ANNUAL MEAN                                                                        669              1907
 LOWEST ANNUAL MEAN                                                                          74.5            1977
   HIGHEST DAILY MEAN                  9000     Jan  2            2380     Jun 16            9000       Jan  2 1997
   LOWEST DAILY MEAN                     50     Dec 26              40     Jan  3              14       Jul 24 1924
   ANNUAL SEVEN-DAY MINIMUM              56     Dec 25              48     Dec 29              14       Aug 28 1924
   INSTANTANEOUS PEAK FLOW                                        2730     Jun 22           12500       Jan  2 1997
   INSTANTANEOUS PEAK STAGE                                          8.81  Jun 22              10.23    Jan  2 1997
 ANNUAL RUNOFF (AC-FT)             349900                     324700                     203900                  
 10 PERCENT EXCEEDS                  1370                       1520                        850                  
 50 PERCENT EXCEEDS                   206                        150                         98                  
 90 PERCENT EXCEEDS                    62                         59                         37                  
 
   e  Estimated.