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Water-Year Summary for Site 13142000

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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.)  

Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 43°15'19", long 114°21'29" referenced to North American Datum of 1983, in SE 1/4 NE 1/4 NE 1/4 sec.18, T.2 S., R.18 E., Blaine County, ID, Hydrologic Unit 17040219, Magic Reservoir East quad., at Magic Dam on Big Wood River, 18 mi northwest of Richfield, and at mile 67.5.
DRAINAGE AREA - 1,611 mi².
REVISIONS HISTORY - WSP 1217: Drainage area. WDR-US-2010: Drainage area.
PERIOD OF RECORD - February 1909 to current year. Month-end contents only for some periods, published in WSP 1317.
GAGE - Nonrecording gage. Datum of gage is Idaho Irrigation Co. datum, which is reported to be about 137 ft below NGVD of 1929. Datum of gages prior to Oct. 1, 1942 was 4,000 ft lower. Datum of gages Oct. 1, 1942 to Sept. 30, 1974, was 800 ft higher; Oct. 1, 1974 to Sept. 30, 1988, was 4,000 ft lower.
COOPERATION - Stage readings and capacity table provided by the Big Wood Canal Company.
REMARKS - Reservoir is formed by earth and rock-fill dam completed in 1909 and raised 5 ft in 1917. Capacity is 191,500 acre-ft between gage heights 4,821.4 ft, 2.9 ft above bottom of outlet pipe, and 4,935.0 ft, top of 5-ft flashboards. Dead storage unknown. Water is used for power generation and irrigation of about 68,000 acres of land in Carey Act project of Big Wood Canal Co. Powerhouse was installed Dec. 1988. Diversions above station for irrigation of about 32,600 acres, of which about 1,900 acres are irrigated by withdrawals from groundwater (1966 determination). Figures given herein represent usable contents, including bank storage.
EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 195,400 acre-ft May 11-13, 1969, elevation, 4,936.0 ft, present datum; no storage for several days in 1909, 1919-20, 1924, 1928, 1935.