11351950 PIT RIVER BELOW DIVERSION TO MUCK VALLEY POWERPLANT, NEAR BIEBER, CA

LOCATION.-Lat 41°00'55", long 121°09'13", in NE 1/4 SW 1/4 sec.27, T.37 N., R.7 E., Lassen County, Hydrologic Unit 18020003, on right bank 1.7 mi 
upstream from North Gulch, 2.2 mi upstream from Spring Gulch, and 7.4 mi south of Bieber. 
DRAINAGE AREA.-2,475 mi2, excluding Goose Lake Basin. 
PERIOD OF RECORD.-October 1994 to current year. 
GAGE.-Acoustic velocity meter measures minimum bypass flow and water-stage recorder and Ogee weir for spillway. Elevation of gage is 4,120 ft above sea level, 
from topographic map. 
REMARKS.-Flow at this station has two components which are combined for publication: low flow release (station 11351946) and flow over Ogee weir (station 
11351948). Water is diverted upstream of weir through a tunnel to Collett Reservoir (station 11351600), for power generation. During powerplant operation, the 
minimum release is 50 ft3/s. See schematic diagram of Pit and McCloud River Basins. 
COOPERATION.-Records were provided by Malacha Hydro Limited Partnership, under general supervision of the U.S. Geological Survey, in connection with a Federal 
Energy Regulatory commission project. 
EXTREMES FOR PERIOD OF RECORD.-Maximum daily discharge, 16,800 ft3/s, Jan. 3, 1997; no flow many days during 1995 and 1997. 

                  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        23       39       52       52      231      911     1790      351     2200      418       54     24  
  2        11       11       52       52      181     1210     1830      385     2040      246       54     46  
  3        10       45       52       52      470     1580     1920      402     1880       84       54     53  
  4        10       35       52       52     1020     1860     1970      522     1920       53       51     45  
  5        10       29       53       52     1060     1790     1990      725     1990       54       23     41  
  6        32       38       53       52      848     1390     1970      973     1880       54       17     45  
  7        46       41       53       52      631     1020     1810     1370     1740       54       31      8.0
  8        22       52       53       52      437      807     1690     1440     1670       54       47     26  
  9        30       52       53       52      385      594     1690     1830     1560       54       51      6.0
 10        34       52       53       52      402      504     1560     2580     1490       54       23      6.0
 
 11        42       21       53       53      351      436     1530     3150     1810       54       19     33  
 12        54       36       52     1280      351      436     1210     3910     2110       54       23     53  
 13        54       53       53     1970      487      594     1060     4480     2510       54       24     53  
 14        53       53       53     2410      613      612     1040     4690     2870       55       22     52  
 15        54       53       53     2290     1060      558      952     4850     3170       55       20     22  
 16        49       52       53     1900     1080      746      848     4830     3050       55       25     35  
 17        54       52       53     1950      869     1240      746     5020     2850       54       24     53  
 18        54       52       53     2510      613     1300      631     5070     2650       53       31     53  
 19        51       52       53     3030      385     1080      522     5100     2510       53       30     53  
 20        42       52       53     2980      385      725      453     4590     2240       52       32     53  
 
 21        36       52       53     2290      436      576      368     4090     2080       17       35     53  
 22        44       52       52     1390      505      828      334     3640     1920       38       35     53  
 23        31       52       52      705      725     1490      317     2870     1720       54       33     52  
 24        39       52       52      453      631     1830      402     2250     1490       30       35     53  
 25        37       52       52      402      577     1990      504     2200     1370       14       28     53  
 26        10       52       52      419      523     1880      540     2180     1210       54       23     53  
 27        35       52       52      488      522     1650      613     2250      993       54       23     53  
 28        34       52       52      454      685     1510      540     2290      847       54       23     53  
 29        30       52       52      368      ---     1490      522     2290      744       54       24     53  
 30        35       52       52      523      ---     1560      487     2290      575       54       29     53  
 31        39      ---       52      402      ---     1650      ---     2250      ---       54       29      ---
 
TOTAL    1105     1390     1628    28787    16463    35847    31839    84868    57089     2141      972   1289.0
MEAN     35.6     46.3     52.5      929      588     1156     1061     2738     1903     69.1     31.4     43.0
MAX        54       53       53     3030     1080     1990     1990     5100     3170      418       54       53
MIN        10       11       52       52      181      436      317      351      575       14       17      6.0
AC-FT    2190     2760     3230    57100    32650    71100    63150   168300   113200     4250     1930     2560
 


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1995 - 1998, BY WATER YEAR (WY)                                 
          OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
MEAN     36.2     50.8      169     1564     1517     1653      984     1785      629     36.0     11.1     29.1
MAX      44.3     53.5      444     3344     3089     3316     1677     3679     1903     69.1     31.4     43.0
(WY)     1997     1996     1997     1997     1996     1995     1995     1995     1998     1998     1998     1998
MIN      21.5     46.3     52.5      336      588      366      248      102     47.1     4.77     2.65     19.8
(WY)     1995     1998     1998     1996     1998     1997     1997     1997     1997     1997     1997     1997
 
SUMMARY STATISTICS           FOR 1997 CALENDAR YEAR        FOR 1998 WATER YEAR           WATER YEARS 1995 - 1998
 
ANNUAL TOTAL                      171725.00                  263418.0                                           
ANNUAL MEAN                          470                        722                        702                  
HIGHEST ANNUAL MEAN                                                                        997              1995
LOWEST ANNUAL MEAN                                                                         505              1997
  HIGHEST DAILY MEAN                 16800     Jan  3            5100     May 19           16800       Jan  3 1997
  LOWEST DAILY MEAN                       .00  Jul 16               6.0   Sep  9                .00    Oct  1 1994
  ANNUAL SEVEN-DAY MINIMUM                .00  Jul 16              20     Oct  2                .00    Aug  3 1995
ANNUAL RUNOFF (AC-FT)             340600                     522500                     508900                  
10 PERCENT EXCEEDS                   827                       2190                       2070                  
50 PERCENT EXCEEDS                    52                         54                         54                  
90 PERCENT EXCEEDS                     1.0                       30                          7.0