LOCATION.--Lat 43° 58'21", long 113° 44'43"(Rev.)(NAD83), in NE1/4 NE1/4 sec.5 (Rev.), T.7 N., R.23 E., Custer County, Hydrologic Unit 17040218, Mackay Reservoir quad., on left bank 3 mi upstream from Mackay Dam, and 7.5 mi northwest of Mackay.

PERIOD OF RECORD.--May 1919 to November 1959 (discontinued).

GAGE.--Water-stage recorder. Datum of gage is 6,062.38 ft above NGVD of 1929, unadjusted. Prior to May 14, 1938, water-stage recorder at site 200 ft upstream at different datums. Staff gage on Mackay Reservoir is used as an auxiliary gage during periods of backwater from reservoir.

REMARKS.--Diversions for irrigation above station. For sum of surface inflow to Mackay Reservoir, see station 13125500.

COOPERATION.--At times, gage height record and discharge measurements furnished by water commissioner for Big Lost River.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,200 ft³/s (estimated) about June 12, 1921, gage height, 4.45 ft, from floodmark, site and datum then in use; maximum gage height, 5.61 ft, July 2, 1957, backwater from Mackay Reservoir; minimum discharge, 3.8 ft³/s Mar. 9, 1956, gage height, 1.73 ft.