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USGS Water-Year Summary 2024
12419000 SPOKANE RIVER NEAR POST FALLS, ID
LOCATION - Lat 47°42'11", long 116°58'40" referenced to North American Datum of 1983, in SW 1/4 SW 1/4 SW 1/4 sec.04, T.50 N., R.5 W., Kootenai County, ID, Hydrologic Unit 17010305, Post Falls quad., on right bank 1 mi downstream from power plant of Avista Utilities, 1.5 mi southwest of Post Falls, and at mile 100.7.
DRAINAGE AREA - 3,830 mi². of which about 122 mi² in the vicinity of Hayden Lake is noncontributing.
REVISIONS HISTORY - WDR-US-2010: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1912 to current year (prior to January 1913, monthly discharge only, published in WSP 870 and 1736). Prior to October 1949, published as "at Post Falls."
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 2,050 ft, referred to originally accepted elevation of 2,157.40 ft for the U.S. Geological Survey bench mark in southeast corner of Idaho First National Bank Building (see WSP 882). Datum of gage based on NGVD of 1929, supplementary adjustment of 1947, is 2,047.00 ft. Datum of gage using NAVD88 is 2,050.885 ft.
Jan. 1, 1913 to Nov. 21, 1920, non recording gage, and Nov. 22, 1920 to Sept. 15, 1934, recording gage 0.6 mi upstream. From Sept. 16, 1934 to Nov. 15, 1949, recording gage 0.8 mi upstream. From Nov. 16, 1949, at present site. Datum of all gages prior to Sept. 30, 1964, 50 ft lower.
REMARKS - Flow regulated by dam at Post Falls and affected by storage in Coeur d'Alene Lake (sta 12415500).
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 50,100 ft³/s, when recorder was not operating, Dec. 25, 1933, (determined from unpublished records collected by Washington Water Power Co. for station at Liberty Bridge); minimum, 65 ft³/s July 25, 30, 1973; minimum gage height, 4.68 ft, July 20, 21, 1977.
