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USGS Operation Discontinued.
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.
15-minute data should also be available on the
USBR web site here,
under the Central/Lower Snake River Basin block.
For more information about this gaging station, or to obtain unit values
or daily values data, check the Idaho Power
web site here
or telephone (208) 388-2939.
LOCATION.--Lat 45° 15'05", long 116° 41'50", in SE1/4 SE1/4 sec.33, T.3 S., R.49 E.,
Wallowa County, Oregon, Wallowa-Whitman National
Forest, Hydrologic Unit 17050201, on left bank, 0.6 mi downstream from Hells Canyon Dam,
and at mile 247.0.
DRAINAGE AREA.--73,300 mi2, approximately.
PERIOD OF RECORD.--July 1965 to current year.
GAGE.--Datum of gage is 1,400.00 ft above NGVD of 1929 (levels by Idaho Power Company).
REMARKS.--Flow regulated by many reservoirs above station, with a total usable capacity
of more than 10,000,000 acre-feet. Diurnal fluctuations caused by Hells Canyon powerplant.
COOPERATION.--Discharge records furnished by Idaho Power 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.
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