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USGS Water-Year Summary 2024
13087900 MILNER LAKE AT MILNER DAM, ID
LOCATION - Lat 42°31'23", long 114°00'48" referenced to North American Datum of 1983, in sec.29, T.10 S., R.21 E., Twin Falls County, ID, Hydrologic Unit 17040209, Milner quad., near left end of Milner Dam on Snake River at Milner, at mile 639.1.
DRAINAGE AREA - 17,180 mi². excluding indeterminate nontributary area on Snake River Plain.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1974 to current year. Prior to October 1989, published as "Lake Milner."
GAGE - Water-stage recorder. Datum of gage is 4,125.35 feet above NAVD 1988 (USGS). October 1974 to May 1978, non-recording gage at same site and datum.
REMARKS - Reservoir is formed by a concrete gravity dam constructed in 1904 with first diversions in 1905. The dam is primarily a diversion dam. Capacity is a function of the river flow and the lake elevation at the dam. No precise limits on capacity can be set, but computations indicate 50,200 acre-ft of usable storage at a lake gage reading of 11.5 ft, a river flow of 30,000 ft³/s, and 11,200 acre-ft at a lake gage of 1.5 ft and a river flow of 500 ft³/s. The capacity table was revised in 1984 and extended in 2001. Dead storage is 8,000 acre-ft. Water is used for irrigation by canals diverting at the dam and by pumps from the reservoir.
EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 54,500 acre-ft June 25, 1997; maximum gage height, 11.55 ft, Apr. 2, 1999; minimum contents, 10,800 acre-ft Dec. 15, 1988, Mar. 3, 1992; minimum gage height, 1.24 ft, Dec. 26, 1988.
