PROVISIONAL DATA SUBJECT TO REVISION

Beginning April 2001, the operation of this gage was assumed by Idaho Power Company, which had previously contracted with the USGS. Due to continuing interest for the most recent 15-minute tabular data, that information is made available through this web page. This data is PROVISIONAL and has not been reviewed by USGS. For more information about this gaging station, or to obtain unit values or daily values data, check the Idaho Power web site here or contact Idaho Power at (208) 388-2939.

DRAINAGE AREA.--73,300 mi2, approximately.

PERIOD OF RECORD.--July 1965 to current year.

REVISED RECORDS.--WDR ID-78-2: 1969-70, 1972-76, WDR ID-79-2: 1972-73(m).

GAGE.--Water-stage recorder. Datum of gage is 1,400.00 ft above NGVD of 1929 
   (levels by IPC).

REMARKS.--Flow regulated by many reservoirs above station, with a total 
   usable capacity of more than 10,000,000 acre-feet, the most effective 
   of which is Brownlee Reservoir 38 mi upstream (see sta 13289700). 
   Diurnal fluctuations caused by Hells Canyon powerplant. Diversions above 
   station for irrigation of about 3,820,000 acres, of which 742,000 acres 
   are irrigated by withdrawals from ground water (1966 determination). 

COOPERATION.--Discharge records furnished by IPC and reviewed by 
   U.S. Geological Survey beginning October 2001.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 103,000 ft3/s Jan. 2, 1997, 
   gage height, 86.17 ft; minimum, 1,580 ft3/s Mar. 19, 1967, gage height, 59.9 ft; 
   minimum daily, 4,360 ft3/s May 8, 1977.