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LOCATION.--Lat 42° 40'23", long 113° 29'58", in SW1/4 NE1/4 sec.2,
T.9 S., R.25 E., Minidoka County, Lake Walcott West quad., Hydrologic Unit
17040209, on right bank 1 mi downstream from Minidoka Dam, 6 mi south of
Minidoka, and at mile 673.5.
DRAINAGE AREA.--15,700 mi2, approximately, excluding indeterminate nontributary
area on Snake River Plain.
PERIOD OF RECORD.--April 21, 1910 to current year. Monthly discharge only for
some periods, published in WSP 1317. Published as "below Minidoka Dam, at
Howell's Ferry", 1911. Records for August 1895 to Apr. 20, 1910, at site
6 mi downstream "at Montgomery Ferry near Minidoka" are not equivalent.
REVISED RECORDS.--WSP 1347: 1911.
GAGE.--Datum of gage is 4,132.2 ft above NGVD of 1929 (river-profile survey).
Prior to Apr. 21, 1910, nonrecording gage at site 6 mi downstream at different
datum. Apr. 21, 1910 to Aug. 28, 1911, nonrecording gage at present site and datum.
REMARKS.--Flow regulated by Lake Walcott (1906), American Falls Reservoir (1927),
and other reservoirs, having a combined usable capacity of about 4,700,000 acre-ft.
Diversions above station for irrigation of about 128,000 acres below and about
1,200,000 acres above station, of which about 304,000 acres are irrigated by
withdrawals from ground water (1966 determination). Considerable water leaks
into the Snake River Plain aquifer above station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge (1910-26), 45,900 ft3/s June 21, 1918,
gage height, 16.02 ft; minimum daily, 1,700 ft3/s Aug. 2, 1919.
Maximum discharge since regulation (1927-2002), 42,900 ft3/s June 21, 1997,
gage height, 15.49 ft; minimum, 37 ft3/s Jan. 28, 1962.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum discharge of 47,500 ft3/s May 29, 30, 1897,
at site 6 miles downstream at Montgomery Ferry near Minidoka, gage height, 12.6 ft
(datum at that site).
Station operated in cooperation with U.S. Bureau of Reclamation.
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