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Water-Year Summary for Site 12362000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
62614 Elevation, lake/res, NGVD29(Obs.)  

Water year 2022: 2021-10-01 to 2022-09-30

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USGS Water-Year Summary 2022
LOCATION - Lat 48°20'28", long 114°00'48" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 NW 1/4 sec.27, T.30 N., R.19 W., Flathead County, MT, Hydrologic Unit 17010209, in block 14 of Hungry Horse Dam on South Fork Flathead River, 3.8 mi southeast of Hungry Horse, and at river mile 5.3.
DRAINAGE AREA - 1,654 mi².
PERIOD OF RECORD - September 1951 to September 2013 (month-end contents only). October 2013 to current (daily elevations).
GAGE - Water-stage recorder equipped with remote indicator in power house. Elevation of gage is 3,196 ft, referenced to the National Geodetic Vertical Datum of 1929 (levels by U.S. Bureau of Reclamation). During construction and prior to May 1, 1953, various types of nonrecording gages were used.
Reservoir and flow are completely controlled by concrete arch-gravity dam; construction began in 1948 
and was completed in 1952.  Storage began Sept. 21, 1951. Usable capacity is 3,451,000 acre-ft, top of 
1.0 ft flashboards; 3,427,000 acre-ft between elevations 3,196 ft, lowest outlet, and 3,560 ft, 
controlled spillway elevation. Dead storage is 39,730 acre-ft below elevation 3,196 ft. Minimum 
operating level is 445,400 acre-ft, elevation, 3,336 ft for on-site power generation. Water is used 
for power production, flood control, irrigation and recreation. Controlled spillway is an adjustable 
ring gate with 1.0 ft flashboards. 
EXTREMES FOR PERIOD OF RECORD - Maximum elevation observed, 3,561.40 ft, July 3, 4, 1955; minimum elevation observed after normal low operating level was reached in May 1952, 3,362.50 ft., Jan. 13, 1953.