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Water-Year Summary for Site 11400500

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Available Parameters
00060 Discharge(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11400500 Butt Creek below Almanor-Butt Creek Tunnel, near Prattville, CA
LOCATION - Lat 40°11'14", long 121°11'13" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.22, T.27 N., R.7 E., Plumas County, CA, Hydrologic Unit 18020121, Lassen National Forest, on right bank, 500 ft downstream from outlet of old Almanor-Butt Creek Tunnel, and 2.2 mi southwest of Prattville.
DRAINAGE AREA - 69.3 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1936 to September 1959, October 1964 to current year. Published as "below tunnel No. 1" 1938-40. Records for water years 1937-38 published in WSP 1515. Records prior to 1964 not equivalent owing to inflow from Almanor-Butt Creek Tunnel.
GAGE - Water-stage recorder and concrete control. Elevation of gage is 4,300 ft above NGVD of 1929, from topographic map. Prior to Oct. 5, 1937, at site 200 ft downstream at datum 4 ft lower.
COOPERATION - Records were collected by Pacific Gas and Electric Co., under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2105.
REMARKS - No regulation upstream from station. Howell-Bunger valve in conduit from Lake Almanor (station 11399000) to Butt Valley Powerplant (station 11400600) is opened for short periods several times a year, causing sharp peaks. Wallack Ditch upstream from station diverts about 3 ft³/s during each irrigation season into Yellow Creek Basin. There is some inflow 500 ft upstream that is the leakage from the abandoned Almanor-Butt Creek Tunnel. See schematic diagram of North Fork Feather River Basin available from the California Water Science Center.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 4,080 ft³/s, Jan. 1, 1997, gage height, 6.22 ft, from rating curve extended above 1,400 ft³/s; minimum daily, 26 ft³/s, several days during May and June 1976.