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LOCATION.--Lat 45° 11'01", long 113° 53'43", in NE1/4NE1/4 sec.6,
T.21 N., R.22 E., Lemhi County, Hydrologic Unit 17060203, on left bank,
1,000 ft downstream from island, 0.4 mi upstream from Lemhi River,
0.5 mi downstream from highway bridge at Salmon, and at mile 258.9.
DRAINAGE AREA.--3,760 mi2, approximately. Mean elevation, 7,380 ft.
PERIOD OF RECORD.--April 1912 to September 1916, July 1919 to current year.
Monthly discharge only for some periods, published in WSP 1317.
REVISED RECORDS.--WSP 1043: Drainage area. WSP 1317: 1916.
GAGE.--Water-stage recorder. Datum of gage is 3,911.14 ft above NGVD of 1929
(levels by U.S. Army Corps of Engineers). Prior to Oct. 21, 1929,
nonrecording gage at site 700 ft upstream at different datum.
REMARKS.--Diversions above station for irrigation of about 83,800 acres,
of which about 900 acres are irrigated by withdrawals from groundwater
(1966 determination).
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 17,700 ft3/s June 17, 1974,
gage height, 8.67 ft; maximum gage height, 10.33 ft, Feb. 7, 1985, result
of ice jam; minimum, 242 ft3/s Jan. 8, 1937, gage height, 1.50 ft.
Station operated in cooperation with Idaho Department of Water Resources.
Realtime data relay provided by National Weather Service.
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