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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
12087000 MASHEL RIVER NEAR LA GRANDE, WA
LOCATION - Lat 46°51'25", long 122°18'05" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.21, T.16 N., R.4 E., Pierce County, WA, Hydrologic Unit 17110015, on left bank, 50 ft downstream from State Highway 7 bridge, 1.8 mi northeast of La Grande, and at mile 3.3.
DRAINAGE AREA - 80.7 mi².
REVISIONS HISTORY - Revisions: On July 22, 2024, gage height and discharge for the period 03/16/2023-10/10/2023 were revised as quality assurance procedures had not been properly followed. Additional gage height corrections were applied, a new rating was implemented, and associated shifts updated.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1940 to September 1957, October 1991 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 619.53 ft above NGVD of 1929 (from topographic map) and is 623.04 ft above NAVD of 1988 (levels by USGS, Aug. 15, 2022). Prior to Oct. 1, 1957, on right bank at same datum.
REMARKS - Small diversion for municipal supply for Eatonville. Some regulation at low flow by millpond in Eatonville. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 9,520 ft³/s, Feb. 6, 2020, gage height, 7.94 ft, from rating curve extended above 6,920 ft³/s; minimum discharge, 1.35 ft³/s, Sep. 9, 2021.
