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; 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 1998 TO SEPTEMBER 1999
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 53 53 1630 53 86 2750 931 470 54 11 2.0 2.0
2 53 53 2110 53 55 3760 890 419 53 5.0 2.0 2.0
3 53 53 2040 53 54 4590 786 558 53 2.0 2.0 2.0
4 53 53 1630 53 54 5440 667 685 54 2.0 2.0 2.0
5 53 53 1120 53 54 5320 667 766 134 2.0 2.0 2.0
6 53 53 706 54 54 4200 631 667 102 2.0 2.0 2.0
7 53 54 336 53 421 2950 685 595 267 2.0 2.0 12
8 53 54 284 54 1460 2060 725 385 215 2.0 2.0 2.0
9 53 54 54 54 2110 1790 705 282 102 2.0 2.0 2.0
10 53 53 55 54 2390 1630 631 248 54 4.0 2.0 2.0
11 53 53 54 54 3020 1460 649 265 54 2.0 2.0 2.0
12 54 53 102 53 2950 1370 746 282 54 2.0 2.0 2.0
13 53 53 232 54 2490 1330 631 164 54 2.0 2.0 2.0
14 52 53 542 54 1900 1060 558 85 54 2.0 2.0 13
15 52 53 913 53 1350 1150 453 53 54 2.0 2.0 54
16 53 53 971 53 1240 1210 402 53 54 2.0 2.0 54
17 53 53 665 53 1170 1330 282 53 53 2.0 2.0 52
18 53 53 435 54 1490 1350 368 53 51 2.0 2.0 19
19 53 53 214 632 1880 1390 505 54 12 2.0 2.0 27
20 53 53 54 850 1970 1420 705 54 5.0 2.0 20 49
21 53 53 54 996 1810 1370 828 54 21 2.0 24 34
22 53 54 53 954 1580 1330 952 54 7.0 2.0 2.0 35
23 53 55 53 1510 1330 1330 1040 54 21 2.0 22 38
24 53 1020 53 1930 1440 1260 890 54 37 2.0 2.0 38
25 53 1460 53 1830 1900 1210 685 54 15 2.0 16 12
26 53 1100 53 1510 2510 1190 685 54 18 2.0 18 9.0
27 53 1020 53 1020 2420 1190 725 54 12 16 2.0 27
28 53 1260 53 707 2220 1120 766 54 9.0 24 2.0 27
29 53 1330 53 455 --- 995 705 54 12 5.0 2.0 26
30 53 1330 53 198 --- 911 667 54 24 18 17 28
31 53 --- 53 182 --- 869 --- 54 --- 2.0 16 ---
TOTAL 1642 9745 14731 13736 41408 60335 20560 6785 1709.0 131.0 181.0 578.0
MEAN 53.0 325 475 443 1479 1946 685 219 57.0 4.23 5.84 19.3
MAX 54 1460 2110 1930 3020 5440 1040 766 267 24 24 54
MIN 52 53 53 53 54 869 282 53 5.0 2.0 2.0 2.0
AC-FT 3260 19330 29220 27250 82130 119700 40780 13460 3390 260 359 1150
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1995 - 1999, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 39.5 106 230 1340 1510 1712 924 1472 514 29.7 10.0 27.2
MAX 53.0 325 475 3344 3089 3316 1677 3679 1903 69.1 31.4 43.0
(WY) 1999 1999 1999 1997 1996 1995 1995 1995 1998 1998 1998 1998
MIN 21.5 46.3 52.5 336 588 366 248 102 47.1 4.23 2.65 19.3
(WY) 1995 1998 1998 1996 1998 1997 1997 1997 1997 1999 1997 1999
SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1995 - 1999
ANNUAL TOTAL 285413.0 171541.0
ANNUAL MEAN 782 470 656
HIGHEST ANNUAL MEAN 997 1995
LOWEST ANNUAL MEAN 470 1999
HIGHEST DAILY MEAN 5100 May 19 5440 Mar 4 16800 Jan 3
1997
LOWEST DAILY MEAN 6.0 Sep 9 2.0 Jul 3 .00 Oct 1
1994
ANNUAL SEVEN-DAY MINIMUM 22 Aug 10 2.0 Jul 3 .00 Aug 3
1995
ANNUAL RUNOFF (AC-FT) 566100 340300 475200
10 PERCENT EXCEEDS 2190 1450 1920
50 PERCENT EXCEEDS 351 54 54
90 PERCENT EXCEEDS 37 2.0 5.0
USGS Water Resources of California
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