LOCATION.--Lat 44° 31'28", long 116° 02'59"(Rev.)(NAD83), in NE1/4 NE1/4 sec.26, T.14 N., R.3 E., Valley County, Cascade quad., Hydrologic Unit 17050123, in gate-control structure at south end of Cascade Dam, on North Fork Payette River, 0.5 mi downstream from Willow Creek, 0.8 mi northwest of Cascade, and at mile 40.2.

DRAINAGE AREA.--615 mi², revised. Mean elevation, 5,960 ft.

PERIOD OF RECORD.--January to December 1948 (fragmentary), January 1949 to September 1996 (discontinued).

GAGE.--Water-stage recorder. Datum of gage is sea level (U.S. Bureau of Reclamation levels). U.S. Coast and Geodetic Survey datum is 0.66 ft lower. Prior to Nov. 7 1958, nonrecording gage at north end of dam at present datum.

REMARKS.--Reservoir is formed by earthfill dam completed in May 1949. Partial storage began Nov. 7, 1947. Full storage first reached in June 1957. Capacity, 703,200 acre-ft between elevations 4,776 ft, 4.0 ft above sill of outlet tunnel, and 4,828 ft, top of spillway gates. U.S. Bureau of Reclamation attempts to limit withdrawals to elevation 4,787.5 ft, retaining 50,000 acre-ft capacity as dead storage. Contents table computed from tables furnished by U.S. Bureau of Reclamation (revised 1950). Water is used for irrigation of lands in the Payette Division of the Boise Project and for power at Black Canyon powerplant near Emmett.

EXTREMES FOR PERIOD OF RECORD.--Maximum contents observed, 727,000 acre-ft, June 10, 11, 1957, elevation 4,828.89 ft; no contents at times during March and September 1948 (prior to filling of reservoir); minimum after first filling of reservoir in June 1957, 193,000 acre-ft Feb. 8, 1962, elevation 4,802.15 ft.