USGS Water-Year Summary for Site 10312100

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	Available Parameters
	00054 Reservoir storage(Obs.)
	00062 Elevation, reservoir(Obs.)
	62615 Elevation, lake/res, NAVD88(Obs.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

10312100 Lahontan Reservoir Near Fallon, NV

LOCATION - Lat 39°27'45", long 119°04'00" referenced to North American Datum of 1927, in SW 1/4 SE 1/4 sec.33, T.19 N., R.26 E., Churchill County, NV, Hydrologic Unit 16050202, in outlet control house on upstream side of Lahontan Dam on Carson River, 18 mi west of Fallon.

DRAINAGE AREA - 1,799 mi². (not including inflow from Truckee Canal).

REVISIONS HISTORY - WDR NV-79-1: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Jan. 1917 to current year. Monthly contents only for Jan. 1917 to Sep. 1960, published in WSP 1734.

GAGE - Water-stage recorder since Dec. 1999 and float tape with surface contact detector. Prior to 1956, float tape. Datum of gage is Reclamation Service Datum "Lahontan Dam Datum", which is 3.73 ft higher than National Geodetic Vertical Datum of 1929.

REMARKS - Reservoir is formed by earth and gravel-fill dam, constructed by U.S. Bureau of Reclamation. Storage began sometime between the completion of the dam in Jun. 1915 and the beginning of the period of record, Jan. 1917. Capacity, 304,197 acre-ft, elevation 4,162.77 ft. includes 91 acre-ft of dead storage below elevation, 4,070 ft. Surface area at spillway elevation, 13,470 acres. Reservoir is used for irrigation. Total contents and were computed from 0800 hour readings, based on capacity table dated Mar. 09, 1989, new capacity table put into use Apr. 26, 2005. Reservoir stores water from Carson River and from Truckee River via Truckee Canal at Derby Dam. Inflow is regulated by Lake Tahoe (station 10337000), Donner Lake (station 10338400), Prosser Creek (station 10340300), Stampede Reservoir (station 10344300), Boca Reservoir (station 10344490), other reservoirs, and Derby Dam. Extensive irrigation above reservoir in Carson and Truckee River basins.

EXTREMES FOR PERIOD OF RECORD - Maximum contents observed (20-in flashboard on weir), 328,600 acre-ft, Jun. 16, 1942, elevation, 4,164.43 ft; minimum observed, 91 acre-ft, Sep. 07-09, 1929, elevation, 4,070.0 ft.