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Water-Year Summary for Site 12435500

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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
12435500 FEEDER CANAL AT GRAND COULEE, WA
LOCATION - Lat 47°57'05", long 118°59'40" referenced to North American Datum of 1927, in T.28 N., R.30 E., Lincoln County, WA, Hydrologic Unit 17020001, on left bank at Grand Coulee, 0.2 mi downstream from headworks structure, and 0.5 mi southwest of Grand Coulee Dam.
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1952 to current year.
GAGE - Daily discharge determined from flow through pumps or reverse flow through generators. Datum of gage is 1,500.00 ft above NGVD of 1929 (Bureau of Reclamation datum), adjustment of 1937. May 1, 1952, to Jan. 10, 1978, at datum 50.00 ft higher. Jan. 11, 1978, to Feb. 22, 1981, nonrecording gage at datum 1,500.00 ft lower. May 1, 1952, to Oct. 13, 1960, auxiliary gage 0.6 mi downstream from base gage at same datum.
COOPERATION - Discharge records furnished by U. S. Bureau of Reclamation.
REMARKS - Since 1951, water has been pumped (lift about 280 ft) from Franklin D. Roosevelt Lake into the two-mile long Feeder Canal, which empties into Banks Lake. From Banks Lake, it is distributed through a system of canals to the Columbia Basin Project for irrigation. Between May 1951, and December 1974, six pumps were used. Since December 1974, six pump generators, which can also generate power during peak demand periods by returning water from Banks Lake, via the Feeder Canal, to Franklin D. Roosevelt Lake have been added; two in December 1974 and one each in April, June, and November 1983 and April 1984. Discharge is computed from relations between pump operation and head.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 20,300 ft³/s, May 29, 2004, May 31, 2009; minimum daily discharge, -8,580 ft³/s, Dec. 10, 2007, reverse flow from Banks Lake.