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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
12035400 WYNOOCHEE RIVER NEAR GRISDALE, WA
LOCATION - Lat 47°22'50", long 123°36'31" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.20, T.22 N., R.7 W., Grays Harbor County, WA, Hydrologic Unit 17100104, Olympic National Forest, on right bank 0.5 mi downstream from Wynoochee Dam, 1.7 mi north of Grisdale, 1.7 mi downstream from Scatter Creek, and at mile 51.3.
DRAINAGE AREA - 41.3 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1965 to current year.
GAGE - Water-stage recorder. Elevation of gage is 630 ft above NGVD of 1929, from topographic map. Prior to Nov. 3, 1967, at site 1,500 ft upstream at different datum.
REMARKS - Since August 1972, flow regulated by Wynoochee Lake (station 12035380) for flood control, during summer months to augment the natural river flow, and for the water supply for the City of Aberdeen. Some regulation from 1969 to August 1972 due to dam construction. No diversion upstream from station. Tacoma Public Utilities satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 11,800 ft³/s, Dec. 12, 1966, gage height, about 18.0 ft, from graph based on gage readings, site and datum then in use; minimum discharge, 0.9 ft³/s, Sept. 10, 12, 1974, gage height, 0.06 ft.
