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LOCATION.--Lat 45° 54'40", long 116° 00'30"(Rev.)(NAD83), in SE1/4 NW1/4 sec.30, T.30 N.,R.4 E., Idaho County, Grangeville East quad., Hydrologic Unit 17060305, on right bank just downstream from powerhouse of Washington Water Power Co., about 0.2 mi upstream from Schwartz Creek, and 6 mi east of Grangeville.
DRAINAGE AREA.--839 mi2, revised. Mean elevation, 5,160 ft.
PERIOD OF RECORD.--November 1910 to January 1911, March to July 1911, October 1911 to September 1916, April 1923 to September 1963 (discontinued).
GAGE.--Water-stage recorder. Elevation of gage is 1,830 ft above NGVD of 1929, from river-profile map. Nov. 14, 1910 to July 31, 1911, staff gage at datum 2.2 ft higher. Nov. 2, 1911 to Sept. 30, 1916, staff gage at datum 1.0 ft higher. Apr. 1, 1923 to Oct. 15, 1944, chain or staff gages at present (1963) datum.
REMARKS.--Diurnal fluctuations at low stages caused by powerplant just above station. No diversion for irrigation.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge observed, 12,600 ft3/s May 29, 1948, gage height, 12.50 ft; no flow part of Aug. 27, 1947, Aug. 15, 1956; minimum daily, 29 ft3/s Nov. 23, 27, 29, 1952.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of May 30, 1917, reached a stage of 13.6 ft
(present datum), from stage record by powerplant operator, discharge, 15,000 ft3/s.