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USGS Water-Year Summary 2024
12035380 WYNOOCHEE LAKE NEAR GRISDALE, WA
LOCATION - Lat 47°23'08", long 123°36'16" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.20, T.22 N., R.7 W., Grays Harbor County, WA, Hydrologic Unit 17100104, Olympic National Forest, in monolith No. 6, near center line axis of Wynoochee Dam on Wynoochee River, 2.0 mi north of Grisdale, at river mile 51.8.
DRAINAGE AREA - 41 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1972 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 (levels by Corps of Engineers). Prior to May 22, 1973, staff gage on upstream face of dam.
REMARKS - Reservoir is formed by concrete gravity-type dam with gate-type spillway. Construction began in 1969 and was completed in 1972. Usable capacity, 67,288 acre-ft between elevation 690 ft, sluice invert level, and 800 ft, full pool elevation at 69,405 acre-ft. Dead storage 2,117 acre-ft below elevation 690 ft. Figures given herein represent total contents. Water is used for power generation, flood control, water supply, and recreation. Capacity table, dated November 1972, furnished by Corps of Engineers. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 70,087 acre-ft, July 13, 1983, elevation, 800.60 ft; minimum contents observed, 4,227 acre-ft, Oct. 19, 1992, elevation, 701.04 ft.
