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Water-Year Summary for Site 11269500

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Available Parameters
00054 Reservoir storage(Obs.,Obs.)  

Water year 2023: 2022-10-01 to 2023-09-30
 

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USGS Water-Year Summary 2023
11269500 Lake McClure at Exchequer, CA
LOCATION - Lat 37°35'02", long 120°16'09" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.13, T.4 S., R.15 E., Mariposa County, CA, Hydrologic Unit 18040008, on left end of New Exchequer Dam on Merced River, 0.9 mi east of Exchequer, and 5.5 mi northeast of Merced Falls.
DRAINAGE AREA - 1,037 mi².
REVISIONS HISTORY - WSP 881: 1926-32 (yearly summaries only). WSP 1345: 1951 (instantaneous maximum discharge). WSP 1930: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - April 1926 to September 1930 (daily gage heights; also summary of yearly contents in WSP 881), October 1930 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by Merced Irrigation District). Prior to Oct. 1, 1964, indicator in powerplant at same datum. Oct. 1, 1964, to July 31, 1966, nonrecording gage at center of upstream face of dam at same datum.
COOPERATION - Records, including diversion through Exchequer Powerplant (station 11269700), were provided by Merced Irrigation District, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 2179.
REMARKS - Reservoir is formed by a rock-fill dam with a reinforced concrete face completed in March 1967. Dam is downstream from and connected to the original concrete arch and gravity-type dam which was completed in April 1926. Capacity table provided by Merced Irrigation District, dated October 1999. Usable capacity, 1,049,000 acre-ft. Dead storage, 300 acre-ft. Water is released through Exchequer Powerplant down the Merced River to a diversion dam for Merced Irrigation District's main canal. Records, excluding extremes, represent total contents at 2400 hours.
EXTREMES FOR PERIOD OF RECORD - Maximum contents, 1,026,000 acre-ft, July 14, 15, 1969, elevation, 867.2 ft; practically no storage at times in 1926, 1930-31, 1964-65 when reservoir was drained for inspection or construction. Minimum since construction of New Exchequer Dam in 1966 and since lake first filled, 66,100 acre-ft, Feb. 28, 1991, elevation, 588.4 ft.