11406920  THERMALITO AFTERBAY RELEASE TO FEATHER RIVER, NEAR OROVILLE, CA

LOCATION.--Lat 39°27'23", long 121°38'10", in NW 1/4 SE 1/4 sec.33, T.19 N., R.3 E., Butte County, Hydrologic
   Unit 18020106, on left bank of outlet channel 955 ft downstream from centerline of Thermalito Afterbay Dam and
   5.7 mi southwest of Oroville.
PERIOD OF RECORD.--November 1967 to current year.
  WATER TEMPERATURE:  Water years 1969-92.
GAGE.--Water-stage recorder.  Datum of gage is 113.47 ft above sea level (levels by California Department of
   Water Resources).  Prior to May 1, 1970, at datum 13.00 ft lower.
REMARKS.--Flow regulated by gates of Thermalito Afterbay outlet 955 ft upstream.  See schematic diagram showing
   diversions and storage from Feather River at Lake Oroville.
COOPERATION.--Records collected by California Department of Water Resources, under general supervision of the
   U.S. Geological Survey, in connection with a Federal Energy Regulatory Commission project.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 21,600 ft3/s, Jan. 28, 1970, gage height, 23.30 ft, datum then
   in use; no flow for many days during 1968.

                  DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996
                                               DAILY MEAN VALUES

DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP

  1      5840      788      796     1400    12700    13500     6250     5420     7400     6410     4400     2390
  2      5440      790      790     1400    11700    13500     9450     5420     7430     6420     4400     2380
  3      5440      790      794     1400    10700    13500     9450     6410     6440     6420     4900     2390
  4      5440      789      797     1410     9950    13400     9450     6410     5420     6420     5410     2390
  5      5190      794      791     1400    12200    13500     9450     5150     4920     6420     5420     2390
  6      4170      792      789     1400    14100    12000     9450     4140     4400     6420     5420     2390
  7      3150      793      793     1400    13600     9970     9440     3400     4400     6410     5420     2390
  8      2150      795      797     1410    13100     8440     9450     2890     3400     6420     5420     2380
  9      1150      788      794     1410    13200     8430     9450     2390     3380     6420     5420     2390
 10       898      789      792     1410    13500     8430     9450     1890     3400     6420     5410     2390

 11       894      790      794     1410    13500     8440     9450     1680     3400     6170     5410     2390
 12       890      791     3720     1410    13500     8440     9450     1480     3410     5920     5410     2390
 13       896      792     8460     1410    13500     8440     9450     1280     3400     5920     5410     2390
 14       899      791     8470     1410    10500     8440     9450     1080     2900     5920     5420     1890
 15       795      793     8460     1410    10400     8440     9480      877     2380     5920     5410     1680
 16       794      795     8460     1650    11400     8440    13200      875     2380     6170     5150     1480
 17       795      793     8440     2060    13700     8430    13500     5840     2390     6420     4390     1280
 18       742      795     8170     2890    14100     8440    13500    13000     2390     6420     4390     1180
 19       792      795     7190     2900    14100     8430    13400    13100     2390     6420     4400     1180
 20       788      794     6190     2890    14100     8440    11400    13100     2400     6420     4400     1180

 21       789      790     5170     4120    14100     8450     9450    10400     2400     6410     4400     1180
 22       788      792     4440     4410    14100     7950     9450    10300     2390     6420     4400     1180
 23       749      790     4440     4780    14100     6420     8930    13800     2380     6410     4400     1180
 24       546      794     4420     7050    14100     6410     6910    12600     2390     5920     4390     1180
 25       791      796     4420     7930    14100     5930     5430    12400     2390     5410     3640     1180
 26       787      792     4170     9940    14000     5410     5420    10400     2400     5420     3400     1180
 27       796      793     3150    12200    13500     5420     5410     9440     2900     5420     2660     1180
 28       789      794     2160    12500    13500     5420     5410     9450     3630     5410     2390     1170
 29       789      793     1660    12700    13500     5420     5420     9440     4640     5420     2390     1170
 30       794      790     1410    13500      ---     5410     5420     9450     5650     4910     2390     1180
 31       796      ---     1410    13500      ---     5410      ---     8420      ---     4400     2380      ---

TOTAL   55567    23761   113137   136110   378550   266700   270820   211932   109200   187430   138250    52700
MEAN     1792      792     3650     4391    13050     8603     9027     6837     3640     6046     4460     1757
MAX      5840      796     8470    13500    14100    13500    13500    13800     7430     6420     5420     2390
MIN       546      788      789     1400     9950     5410     5410      875     2380     4400     2380     1170
AC-FT  110200    47130   224400   270000   750900   529000   537200   420400   216600   371800   274200   104500


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1968 - 1996, BY WATER YEAR (WY)

MEAN     1943     2479     3968     4280     4755     5619     4702     3592     3028     3562     3372     2887
MAX      5867    11020    15120    14490    14600    16890    15410    12340     9717     6678     7043     7085
(WY)     1975     1974     1984     1970     1983     1983     1983     1983     1983     1983     1974     1974
MIN       145      336     56.7      391      345      239      207      549      337      .13      116      398
(WY)     1978     1978     1968     1993     1968     1992     1992     1977     1990     1968     1968     1968

SUMMARY STATISTICS           FOR 1995 CALENDAR YEAR        FOR 1996 WATER YEAR           WATER YEARS 1968 - 1996

ANNUAL TOTAL                     2446614                    1944157
ANNUAL MEAN                         6703                       5312                       3782
HIGHEST ANNUAL MEAN                                                                       9352              1983
LOWEST ANNUAL MEAN                                                                         970              1991
HIGHEST DAILY MEAN                 17300     Mar 11           14100     Feb  6           21200       Jan 28 1970
LOWEST DAILY MEAN                    546     Oct 24             546     Oct 24                .00    Nov 16 1967
ANNUAL SEVEN-DAY MINIMUM             625     Jan  3             742     Oct 18                .00    Nov 16 1967
INSTANTANEOUS PEAK FLOW                                       15500     May 22           21600       Jan 28 1970
INSTANTANEOUS PEAK STAGE                                          8.45  May 22              23.30    Jan 28 1970
ANNUAL RUNOFF (AC-FT)            4853000                    3856000                    2740000
10 PERCENT EXCEEDS                 14900                      12800                       9120
50 PERCENT EXCEEDS                  5440                       4710                       2220
90 PERCENT EXCEEDS                   792                        793                        457