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USGS Water-Year Summary 2024
13127000 BIG LOST RIVER BELOW MACKAY RESERVOIR, NEAR MACKAY, ID
LOCATION - Lat 43°56'21", long 113°38'54" referenced to North American Datum of 1983, in SW 1/4 NE 1/4 sec.18, T.7 N., R.24 E., Custer County, ID, Hydrologic Unit 17040218, Mackay Reservoir quad., on left bank 1.4 mi downstream from head of Sharp Ditch, 1.6 mi downstream from Mackay Reservoir, and 2.5 mi northwest of Mackay.
DRAINAGE AREA - 801 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - December 1903 to August 1906, and May 1912 to March 1915 (published as "near Mackay"), January 1919 to current year.
GAGE - Water stage recorder and crest stage gage. Datum of gage is 5,950.58 feet above NAVD 1988. Non-recording gage prior to May 12, 1912, and June 5, 1912 to Apr. 28, 1913, at sites within 1 mile upstream at different datums; May 12 to June 4, 1912, at site 1.5 mi. upstream (above Sharp Ditch) at site and datum then in use; Apr. 29, 1913 to Mar. 15, 1915, at site 1 mile downstream (below Streeter Ditch) at site and datum then is use.
REMARKS - Flow completely regulated by Mackay Reservoir (station 13126000). Sharp Ditch is only diversion between station and reservoir; about 12,700 acres of land are irrigated by diversions from river and tributaries above reservoir by surface diversions, and 10,200 acres irrigated by sub-irrigation.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,990 ft³/s June 10, 1921, June 6, 1986; maximum gage height, 6.08 ft, June 6, 1986; minimum discharge, 16 ft³/s Oct. 27, 1967, gage height, 1.11 ft.
