10290500 ROBINSON CREEK AT TWIN LAKES OUTLET, NEAR BRIDGEPORT, CA

LOCATION.-Lat 38°10'20", long 119°19'25", in SE 1/4 SE 1/4 sec.28, T.4 N., R.24 E., Mono County, Hydrologic Unit 16050301, on left bank, 0.2 mi downstream from Lower Twin Lake, and 8 mi southwest of Bridgeport.
DRAINAGE AREA.-39.1 mi2.
PERIOD OF RECORD.-October 1953 to September 1975, May 1992 to September 1994 (irrigation season only), October 1994 to current year.
GAGE.-Water-stage recorder. Elevation of gage is 7,050 ft above sea level, from topographic map.
REMARKS.-Records good, except for estimated daily discharges, which are poor.  Flow regulated by Upper and Lower Twin Lakes.  These data are reviewed and provided by the Nevada District Office, U.S. Geological Survey.
REVISIONS.-WSP 1927:  Drainage area.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 1,170 ft3/s, Jan. 3, 1997, gage height, 5.44 ft; no flow many days, some years.
EXTREMES FOR CURRENT YEAR.-Maximum discharge, 396 ft3/s, July 11, gage height, 3.79 ft; minimum daily, 9.1 ft3/s, Nov. 20, 21.

                  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        32     17         23       21       23       24       38       56       88      339      201       84
   2        31     17         24       22       29       23       36       67       96      337      185       86
   3        30     17         24       22       35       22       35       78      110      338      171       87
   4        30     17         24       22       34       22       33       83      122      342      169       89
   5        30     16         25       21       31       21       32       89      130      343      169       91
   6        29     16         26       17       32       23       31       94      136      341      171       95
   7        27     15         23       19       33       23       30       96      149      342      175       96
   8        27     15         22       22       37       22       29       96      165      351      178       95
   9        27     15         21       22       35       21       28       94      180      372      179       98
  10        26     15         22       22       33       21       28       91      189      387      172      106
 
  11        26     15         22       22       32       21       27       87      195      391      162      110
  12        26     15         22       23       31       21       27       83      204      374      155      107
  13        26     15         22       23       29       20       26       80      209      354      151      100
  14        26     15        e24       22       31       20       26       78      208      342      148       92
  15        26     14         29       24       31       20       25       74      218      330      146       85
  16        26     13         27       25       30       20       25       71      245      307      145       80
  17        26     13         26       25       31       20       25       69      282      292      142       76
  18        26     13         25       25       29       20       25       68      334      307      137       73
  19        26     12         24       28       28       20       25       66      336      326      132       68
  20        26      9.1       24       28       28       20       25       74      321      335      125       65
 
  21        26      9.1       22       27       28       21       26       85      319      339      118       62
  22        26      9.7       22       26       28       21       27       81      327      335      110       60
  23        25     12         21       26       28       24       31       78      338      322      103       58
  24        25     12         21       25       28       31       35       78      338      306       94       56
  25        24     11         21       25       27       41       38       79      334      299       90       54
  26        21     18         21       25       26       44       40       83      336      282       86       54
  27        18     21         21       21       25       44       41       85      339      263       84       55
  28        18     22         20       21       24       44       43       86      335      241       82       55
  29        18     23         20       23      ---       42       45       89      333      231       81       56
  30        18     23         20       23      ---       40       49       87      336      220       81       56
  31        17      ---       20       22      ---       39      ---       86      ---      214       81      ---
 
 TOTAL     785    454.9      708      719      836      815      951     2511     7252     9902     4223     2349
 MEAN     25.3     15.2     22.8     23.2     29.9     26.3     31.7     81.0      242      319      136     78.3
 MAX        32       23       29       28       37       44       49       96      339      391      201      110
 MIN        17      9.1       20       17       23       20       25       56       88      214       81       54
 AC-FT    1560      902     1400     1430     1660     1620     1890     4980    14380    19640     8380     4660
 
 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1954 - 1998, BY WATER YEAR (WY)                                 
 
 MEAN     21.0     8.60     7.43     16.7     16.2     17.2     46.9      106      192      168     99.5     52.2
 MAX      37.5     25.0     36.1      166     63.4     44.8     79.4      187      349      400      199     89.0
 (WY)     1970     1968     1997     1997     1963     1997     1959     1997     1969     1995     1995     1974
 MIN      7.00      .67     .000     .000     .000     .000     22.3     59.1     68.2     62.0     35.1     15.9
 (WY)     1995     1958     1954     1954     1954     1955     1975     1955     1992     1992     1992     1992
 
 SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1954 - 1998
 
 ANNUAL TOTAL                       34763.9                    31505.9                                           
 ANNUAL MEAN                           95.2                       86.3                       64.7                
 HIGHEST ANNUAL MEAN                                                                        100              1995
 LOWEST ANNUAL MEAN                                                                          33.8            1961
   HIGHEST DAILY MEAN                   998     Jan  3             391     Jul 11             998       Jan  3 1997
   LOWEST DAILY MEAN                      9.1   Nov 20               9.1   Nov 20                .00    Nov  3 1953
   ANNUAL SEVEN-DAY MINIMUM              11     Nov 19              11     Nov 19                .00    Nov  3 1953
   INSTANTANEOUS PEAK FLOW                                         396     Jul 11            1170       Jan  3 1997
   INSTANTANEOUS PEAK STAGE                                          3.79  Jul 11               5.44    Jan  3 1997
 ANNUAL RUNOFF (AC-FT)              68950                      62490                      46900                  
 10 PERCENT EXCEEDS                   224                        302                        164                  
 50 PERCENT EXCEEDS                    65                         31                         31                  
 90 PERCENT EXCEEDS                    21                         20                           .40               
 
   e  Estimated.