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LOCATION.--Lat 43° 36'17", long 112° 03'31", in NE1/4 NW1/4 SW1/4
sec.12, T.3 N., R.37 E., Bonneville County, Hydrologic Unit 17040201,
on right bank 3.5 mi upstream of Idaho Falls Municipal powerplant,
8.0 mi north of Idaho Falls, and at mile 805.
PERIOD OF RECORD.--October 1987 to current year.
GAGE.--Water-stage recorder. Datum of gage is 4,730.00 ft above NGVD of 1929
(levels by U.S. Geological Survey). Records comparable with former station
"Snake River near Idaho Falls" (sta 13057160) except during irrigation season.
REMARKS.--Some regulation by Jackson Lake, Palisades Reservoir, Henrys Lake,
Island Park Reservoir, and Grassy Lake. Diversions above station for irrigation
of about 700,000 acres. Considerable water leaks above station into the Snake
River Plain aquifer. To determine total discharge in the Snake River below
Great Western Spillback, add daily discharges from 13057132 to 13057155.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 48,600 ft3/s June 16, 1997,
gage height, 18.91 ft; minimum daily, 950 ft3/s Dec. 22, 1990.
Station operated in cooperation with Water District No.1.
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