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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
12144500 SNOQUALMIE RIVER NEAR SNOQUALMIE, WA
LOCATION - Lat 47°32'43", long 121°50'28" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.19, T.24 N., R.8 E., King County, WA, Hydrologic Unit 17110010, on right bank 0.3 mi downstream from Snoqualmie Falls, 0.4 mi upstream from Tokul Creek, 1.5 mi northwest of Snoqualmie, and at mile 40.0.
DRAINAGE AREA - 375 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - May 1898 to July 1899; August to September 1899 (monthly discharge only); January to July 1900, September 1902 to July 1904; August to September 1904 (monthly discharge only); October 1904 to September 1905 and November to December 1906 (gage heights only); August 1907 to May 1926 (monthly discharge only); June 1926 to September 1927; October 1927 to September 1932 (monthly discharge only); August 1958 to current year. Published as "near Snoqualmie Falls" 1904-06.
GAGE - Water-stage recorder and crest-stage gage. Elevation of gage is 120 ft above NGVD of 1929, from river-profile map. Datum of gage is 109.05 ft above NAVD of 1988 (USGS GNSS survey, Sept. 2022). Prior to Nov. 3, 1902, and Nov. 1 to Dec. 31, 1906, nonrecording gages upstream and downstream from Snoqualmie Falls at different datum. Nov. 3, 1902, to Sept. 30, 1905, nonrecording gage at site 4 mi upstream and 300 ft downstream from South Fork, at different datum. Prior to Sept. 9, 1999, at site on opposite bank, at same datum.
REMARKS - Medium and low flows affected by powerplant 0.1 mi upstream from station. U.S. Geological Survey satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 74,300 ft³/s, Nov. 24, 1990, gage height, 21.10 ft, revised April 2016, from inside high-water mark; minimum discharge, 9.7 ft³/s, Aug. 14, 27, 1958; minimum daily discharge, 88 ft³/s, Aug. 8, 1960.
