LOCATION.--Lat 43° 19'49", long 111° 12'20" (NAD27), in NW1/4 SE1/4 sec.17, T.1 S., R.45 E., Bonneville County, Palisades Dam quad., Hydrologic Unit 17040104, Caribou National Forest, on left bank on spillway structure of Palisades Dam on Snake River, 3.5 mi upstream from Palisades Creek, 7 mi southeast of Irwin, and at mile 901.6.

DRAINAGE AREA.--5,208 mi².

PERIOD OF RECORD.--October 1955 to September 1979, October 1984 to September 1996 (discontinued).

GAGE.--Water-stage recorder. Outside staff gages attached to concrete headwalls upstream from power and outlet tunnels. Datum of gage is sea level (U.S. Bureau of Reclamation levels). Datum of U.S. Geological Survey is 0.10 ft lower.

REMARKS.--Reservoir is formed by earth-fill, rock-faced dam; partial storage began in October 1955; full storage began in November 1956. Capacity, 1,400,000 acre-ft between elevations 5,372 ft (river level at original outlet tunnels) and 5,620 ft. Dead storage, 44,100 acre-ft at elevation 5,452.43 ft, elevation of completed outlet tunnels. Inactive storage for minimum power head, 199,600 acre-ft at elevation 5,497.5 ft. Water is used for irrigation in Snake River valley. Figures represent total storage.

COOPERATION.--Reservoir elevations and capacity table provided by U.S. Bureau of Reclamation.

EXTREMES FOR PERIOD OF RECORD.--Maximum contents, 1,421,000 acre-ft June 17, 18, 1963, elevation, 5,621.17 ft; minimum observed, 565 acre-ft Jan. 31, 1956 (prior to filling of reservoir); minimum after first filling of reservoir in June 1958, 206,700 acre-ft Oct. 25, 1990, elevation 5,499.04 ft.