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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
12484500 YAKIMA RIVER AT UMTANUM, WA
LOCATION - Lat 46°51'46", long 120°28'44" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 sec.20, T.16 N., R.19 E., Kittitas County, WA, Hydrologic Unit 17030001, Decimal lat 46.86278, Long 120.47889 on right bank at Umtanum railway siding, 0.5 mi upstream from Umtanum Creek, 4.2 mi upstream from McPherson Canyon, 10 mi south of Ellensburg, and at mile 140.4.
DRAINAGE AREA - 1,594 mi².
REVISIONS HISTORY - WSP 412: 1914. WSP 1286: 1910. WSP 1933: Drainage area. WDR-US-2008: 1942.
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 1906 to current year. Monthly discharge for some months during the 1907, 1908, 1916-31 water years, published in WSP 1316.
GAGE - Water-stage recorder. Datum of gage is 1,300.00 ft above NGVD of 1929. Prior to Sept. 28, 1911, nonrecording gage at approximately same site at various datums. Sept. 28, 1911, to Nov. 23, 1936, water-stage recorder at site about 300 ft upstream at datum 26.70 ft higher.
REMARKS - Flow partly regulated by Keechelus, Kachess, and Cle Elum Lakes. Diversions upstream from station for irrigation of about 105,000 acres. Bureau of Reclamation satellite telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 41,000 ft³/s, Nov. 15 or 16, 1906, gage height, 41.1 ft, from floodmarks, present datum; minimum recorded discharge, 138 ft³/s, Oct. 3, 1915, gage height, 2.86 ft, datum then in use.
