PROVISIONAL DATA SUBJECT TO REVISION

LOCATION.--Lat 43° 56'21", long 113° 38'54", in SW1/4 NE1/4 SE1/4 
sec.18, T.7 N., R.24 E., Custer County, Hydrologic Unit 17040218, 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.--813 mi2.

PERIOD OF RECORD.--December 1903 to August 1906, and May 1912 to March 1915 
(published as "near Mackay"), January 1919 to current year.

REVISED RECORDS.--WSP 1347: 1904-6.

GAGE.--Datum of gage is 5,946.39 ft above NGVD of 1929. Nonrecording gage prior to 
May 12, 1912, and June 5, 1912 to Apr. 28, 1913, at sites within 1 mi upstream 
at different datums; May 12 to June 4, 1912, at site 1.5 mi upstream (above 
Sharp ditch) at different datum; Apr. 29, 1913 to Mar. 15, 1915, at site 
1 mi downstream (below Streeter ditch) at different datum.

REMARKS.--Flow completely regulated by Mackay Reservoir (see sta 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 subirrigation.

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, 16 ft3/s Oct. 27, 1967, gage height, 1.11 ft.

Station operated in cooperation with Idaho Department of Water Resources, Big Lost Irrigation District, and U.S. Department of Energy.