LOCATION.--Lat 48° 05'30", long 116° 07'00" (NAD83), in NE1/4 sec.30,
T.55 N., R.3 E., Bonner County, Hydrologic Unit 17010213, Cabinet quad.,
on right bank 3.0 mi downstream from Cabinet Gorge Dam, 4.5 mi southeast
of Clark Fork, and at mile 146.9.
DRAINAGE AREA.--22,073 mi2.
PERIOD OF RECORD.--September 1928 to current year. Prior to October 1952,
published as "near Heron, Mont."
REVISED RECORDS.--WSP 1182: 1936. WSP 1736: 1931, 1936(m), 1937. WRD ID-73-1: 1972(M).
REMARKS.--Flow regulated by Hungry Horse Reservoir, Flathead Lake, and Noxon
Rapids Reservoir. Extreme diurnal fluctuation caused by powerplant at Cabinet
Gorge Dam. Diversions above station for irrigation of about 354,000 acres.
Discharge measurements made at Whitehorse Rapids indicate about 600 ft3/s
ground-water inflow between the measuring cableway for Clark Fork River
below Cabinet Gorge Dam (sta 12391950) and Whitehorse Rapids. Records
given herein represent flow at Whitehorse Rapids, computed by adding this
600 ft3/s to observed flows at 12391950, and are considered comparable to
records at former site "near Heron", except for minor surface inflow
from additional drainage area.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 153,000 ft3/s May 29 to
June 1, 1948; maximum gage height, 50.97 ft, May 31, 1948, site and datum
then in use; minimum observed, 270 ft3/s Aug. 12, 1952 (discharge measurement),
at sites in use since October 1952, during filling of Cabinet Gorge Reservoir;
minimum daily since reservoir filled, 762 ft3/s Sept. 2, 1962.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood in June 1894 reached a discharge of
195,000 ft3/s from floodmark, elevation of 2,137.1 ft, at site about 4 mi
upstream and 0.1 mi below "near Heron" site.
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