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LOCATION.--Lat 43° 34'29", long 118° 12'31", on line between NW1/4 SE1/4 and
SW1/4 NW1/4 sec.17, T.23 S., R.37 E., Malheur County, Oregon, Hydrologic Unit 17050116,
on left bank 0.9 mi downstream from Warmsprings Dam, 3.0 mi upstream from South Fork,
4.0 mi northwest of Riverside, and at mile 113.
DRAINAGE AREA.--1,100 mi2, approximately.
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 current year.
Monthly discharges 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" 1906-07, as "Middle Fork of Malheur River above South Fork at Riverside"
1909-10, as "Malheur River above South Fork, at Riverside" 1906-10, in WSP 370, and
as "Malheur River at Warmsprings reservoir site, near Riverside" 1914-17.
REVISED RECORDS.--WSP 833: 1936. WSP 1063: 1942-45. WSP 1397: 1909-10, 1917.
WSP 1447: 1955. See also "PERIOD OF RECORD".
GAGE.--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 Warmsprings Reservoir
(sta 13214500). Diversions for irrigation upstream from station.
AVERAGE DISCHARGE.--83 years (water years 1920-2002), 189 ft3/s, 137,100 acre-ft/yr.
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.
Station operated in cooperation with U.S. Bureau of Reclamation.
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