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USGS Water-Year Summary 2024
13215000 MALHEUR RIVER BELOW WARMSPRINGS RESERVOIR, NEAR RIVERSIDE, OR
LOCATION - Lat 43°34'28", long 118°12'35" referenced to North American Datum of 1983, in NW 1/4 SW 1/4 sec.17, T.23 S., R.37 E., Malheur County, OR, Hydrologic Unit 17050116, on left bank, 0.9 mi downstream from Warm Springs Dam, 3.0 mi upstream from South Fork, 4.0 mi northwest of Riverside and at mile 113.
DRAINAGE AREA - 1,100 mi². approximately.
REVISIONS HISTORY - WSP 833: 1936. WSP 1063: 1942-45. WSP 1397: 1909-10, 1917. WSP 1447: 1955. See also PERIOD OF RECORD.
SURFACE-WATER RECORDS
PERIOD OF RECORD - January 1906 to March 1907 and December 1908 (gage heights only), January 1909 to September 1910, December 1914 to July 1917, March 1919 to September 2017 (discontinued). Monthly discharge only for some periods, published in WSP 1317. Figures of discharge for January 1906 to March 1907, published in WSP 272 and 370, have been found to be unreliable and should not be used. Published as Middle Fork of Malheur River at Riverside 1906-7, as Middle Fork of Malheur River above South Fork, at Riverside 1909-10, as Malheur River above South Fork, at Riverside in WSP 370, 1906-10 and as Malheur River at Warmsprings reservoir site, near Riverside 1914-17.
GAGE - Water-stage recorder. Elevation of gage is 3,305 ft above NGVD of 1929, by barometer. See WSP 1317 or 1737 for history of changes prior to Sept. 29, 1949.
REMARKS - Flow completely regulated since November 1919 by Warm Springs Reservoir (active capacity, 191,100 acre-ft). Diversions for irrigation upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge observed, 7,200 ft³/s Mar. 1, 1910, gage height, 10.7 ft, site and datum then in use, from rating curve extended above 820 ft³/s; maximum discharge since storage began November 1919, 3,150 ft³/s Mar. 22, 1984, gage height, 9.70 ft, from floodmark; no flow at times.
