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USGS Water-Year Summary 2024
12027500 CHEHALIS RIVER NEAR GRAND MOUND, WA
LOCATION - Lat 46°46'34", long 123°02'04" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 sec.22, T.15 N., R.3 W., Thurston County, WA, Hydrologic Unit 17100103, on left bank at downstream side of highway bridge at Meadows, 1.5 mi southwest of Grand Mound, 7.0 mi downstream from Skookumchuck River, and at mile 59.9.
DRAINAGE AREA - 895 mi².
REVISIONS HISTORY - WSP 1216: Drainage area. WSP 1286: 1929-30(M), 1931, 1932-34(M). Discharge for the period Aug. 2, 2018 to Oct. 28, 2020 was revised on Feb. 4, 2021, based on changes to the stage-discharge rating. Discharge less than 5,930 cfs for the period June 12, 2021 to Jan. 3, 2022 was revised Aug. 17, 2022, based on changes to the stage-discharge rating.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1928 to current year.
GAGE - Water-stage recorder. Datum of gage is NAVD of 1988 (USGS GNSS Level II survey). Prior to May 10, 2018, water-stage recorder at present site at datum 123.65 ft above NGVD of 1929. Prior to Oct. 3, 1934, nonrecording gage at present site at datum 3.0 ft higher.
REMARKS - Minor effect from regulation by Skookumchuck Dam since January 1971. Up to 54 ft³/s of Skookumchuck River is consumptively used at Centralia steam generating plant. Many small diversions for irrigation and domestic use upstream from station, including about 3 ft³/s for municipal water supply for Centralia and Chehalis. Water temperatures March 1952 to September 1974. Miscellaneous suspended sediment data published for water years 1962-64. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 79,100 ft³/s, Dec. 4, 2007, gage height, 147.26 ft, present datum; minimum discharge, 82 ft³/s, Aug. 30, 1967.
