11407150 FEATHER RIVER NEAR GRIDLEY, CA

LOCATION.-Lat 39°22'00", long 121°38'46", in Boga Fernandez Grant, T.18 N., R.3 E., Butte County, Hydrologic Unit 18020106, on right bank 300 ft 
upstream from highway bridge and 2.7 mi east of Gridley. 
DRAINAGE AREA.-3,676 mi2. 
PERIOD OF RECORD.-October 1964 to September 1998 (discontinued). January 1944 to September 1964 are published in reports by California Department of Water 
Resources. 
  CHEMICAL DATA: Water years 1979-81. 
  WATER TEMPERATURE: Water years 1965-93. 
  SEDIMENT DATA: Water years 1965-93. 
REVISED RECORDS.-WDR CA-80-4: 1967(M), 1968(M). 
GAGE.-Water-stage recorder. Datum of gage is 2.9l ft below sea level. Prior to Mar. 13, 1966, water-stage recorder on left bank, at same datum. Mar. 14, 1966, to 
Sept. 30, 1973, gage at present location, with datum 47.09 ft above sea level. 
REMARKS.-Records good. Flow regulated by Lake Oroville since November 1967 (station 11406800) and Thermalito Afterbay release to Feather River since December 
1967 (station 11406920). See schematic diagrams showing diversions and storage from Feather River at Lake Oroville and lower Sacramento River Bbasin. 
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 151,000 ft3/s, Dec. 23, 1964, gage height, 100.43 ft, present datum; minimum daily, 117 
ft3/s, June 27, 1966. Since completion of Oroville Dam in 1967, maximum discharge, 163,000 ft3/s, Jan. 2, 1997, gage height recorded, 98.83 
ft, 100.42 ft, from outside gage; minimum daily, 366 ft3/s, July 26, 1968. 
EXTREMES OUTSIDE PERIOD OF RECORD.-Flood of Dec. 23, 1955, reached a stage of 102.25 ft, present datum, discharge unknown. 

                  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      4230     2270     1790     1760     6680    14100    13900     6670     9910     7820     5040     6020
  2      4170     2270     1770     1740     7320    14000    13600     6620     9210     7790     5070     6430
  3      4130     2260     1730     1750    16500    14000    13500     6640     9010     7790     5130     6790
  4      4140     2270     1770     1770    25400    10900    11200     6680     9010     7800     5160     7360
  5      4080     2270     1740     1710    25100    10100    10000     7510     9030     7810     5170     7310
 
  6      4030     2270     1770     1680    25100    10100     9950     7510     9020     7510     5140     7350
  7      3530     2270     1840     1830    25800     8650     9950     7160     8930     6630     5150     7440
  8      3480     2240     1790     1880    25600     8410     9920     5360     8910     6560     6370     7730
  9      3530     2210     1740     1920    25000     8420     9930     4780     8970     6510     6760     7420
 10      3440     2200     1760     1990    24900     8460     9960     4780     8950     6270     6790     6470
 
 11      3420     2200     1780     2100    24800     8500     9940     5790     8920     5490     6090     5680
 12      3410     2250     1750     2250    24700     8480     9890     9740     9210     5200     6030     4840
 13      2880     2290     1720     2270    24400     8450     9910     9960    10200     5210     6050     4290
 14      2260     2270     1790     4270    19700     8440     9920    10000    11400     5190     6060     4170
 15      2260     2250     1760     5570    14800     8480     9960    10100    11400     5190     6030     4160
 
 16      2240     2250     1770     9760    14400     8460     9970    10100    11100     5180     6000     4590
 17      2250     2270     1770     9710    14300     7090     8430    10000    10200     5160     5970     5250
 18      2240     2270     1790     9220    14200     7310     8410   e10000     9410     5160     5930     5830
 19      2240     2300     1810     9280    14300    10000     8410   e10000     8590     5170     5940     5840
 20      2220     2250     1810    10100    14200    10100     7700    e9990     8010     5140     5940     5880
 
 21      2240     2270     1780    13100    14400    12700     6750   e10000     7950     5060     5950     5880
 22      2250     2260     1770    12900    14400    13600     6740    e9960     7930     4970     5960     5840
 23      2250     2280     1790    13200    14300    13600     6670    e9960     7920     4980     5980     5820
 24      2180     2290     1780    13400    14200    13700     6610    e9930     7680     5000     6010     5820
 25      2190     2170     1800    12200    14100    16300     6570    e9910     7050     5040     6000     5790
 
 26      2210     2070     1790    11800    14100    24100     6610    e9860     7350     5090     5600     5780
 27      2240     1830     1790    10900    14100    24300     6710    e7990     7890     5110     5590     5800
 28      2210     1790     1820     6770    14100    24300     6730    e7620     7930     5070     5610     5780
 29      2230     1760     1860     6730      ---    24300     6730    e9260     7850     5020     5620     5820
 30      2240     1840     1840     6650      ---    24300     6730     9790     7850     4960     5650     5800
 31      2290      ---     1840     6630      ---    20800      ---     9870      ---     4980     5670      ---
 
TOTAL   88710    65690    55310   196840   500900   404450   271300   263540   266790   179860   179460   178980
MEAN     2862     2190     1784     6350    17890    13050     9043     8501     8893     5802     5789     5966
MAX      4230     2300     1860    13400    25800    24300    13900    10100    11400     7820     6790     7730
MIN      2180     1760     1720     1680     6680     7090     6570     4780     7050     4960     5040     4160
AC-FT  176000   130300   109700   390400   993500   802200   538100   522700   529200   356800   356000   355000
    e  Estimated.


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1969 - 1998, BY WATER YEAR (WY)                                 
 
          OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
MEAN     2425     3093     5494     8131     7822     8100     5836     4440     3723     4333     4008     3461
MAX      6520    12940    22700    40630    34170    33530    22630    19010     9996     7364     7565     7872
(WY)     1975     1974     1984     1997     1986     1983     1982     1995     1983     1997     1974     1974
MIN       853      855      832      936      905      895      804      809      913     1708     1059     1002
(WY)     1978     1978     1978     1992     1991     1992     1991     1977     1990     1970     1991     1990
 
SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1969 - 1998
 
ANNUAL TOTAL                     2706880                    2651830                                             
ANNUAL MEAN                         7416                       7265                       5063                  
HIGHEST ANNUAL MEAN                                                                      11880              1983
LOWEST ANNUAL MEAN                                                                        1394              1977
  HIGHEST DAILY MEAN                150000     Jan  2           25800     Feb  7          150000       Jan  2 1997
  LOWEST DAILY MEAN                   1040     Apr 10            1680     Jan  6             602       May 21 1977
  ANNUAL SEVEN-DAY MINIMUM            1060     Apr  8            1750     Jan  1             611       May 18 1977
  INSTANTANEOUS PEAK FLOW                                       26400     Feb  7          150000       Feb 19 1986
  INSTANTANEOUS PEAK STAGE                                         83.53  Feb  7             100.06    Feb 19 1986
ANNUAL RUNOFF (AC-FT)            5369000                    5260000                    3668000                  
10 PERCENT EXCEEDS                 15500                      13900                      10200                  
50 PERCENT EXCEEDS                  2690                       6370                       2780                  
90 PERCENT EXCEEDS                  1330                       1830                       1090