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Water-Year Summary for Site 13087900

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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Available Parameters
00054 Reservoir storage(Obs.)  
00054 Reservoir storage(Obs.) [(2)]  

Water year 2020: 2020-10-01 to 2021-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 42°31'23", long 114°00'48" referenced to North American Datum of 1983, in SW 1/4 NE 1/4 SE 1/4 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.
PERIOD OF RECORD - October 1974 to current year. Prior to October 1989, published as "Lake Milner."
GAGE - Water-stage recorder. Datum of gage is 4,122.51 ft above NGVD of 1929. 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.