LOCATION.--Lat 42° 31'41", long 114° 01'06"
(NAD83), in SW1/4 NE1/4 sec.29, T.10 S., R.21 E., Twin Falls County,
Hydrologic Unit 17040212, Milner quad., on left bank 200 ft
downstream from highway bridge at Milner, 0.4 mi downstream from
Milner Dam, and at mile 638.7.
DRAINAGE AREA.--20,700 mi², approximately. Mean elevation, 6,230
PERIOD OF RECORD.--November 1992 to current year (see
GAGE.--Water-stage recorder and crest-stage gage. Datum of gage is
4,062.9 ft above NGVD of 1929.
REMARKS.--Flow regulated by American Falls Reservoir, Lake
Walcott, Milner Lake, and other reservoirs having a combined usable
capacity of about 4,700,000 acre-ft. The flow at this site represents
discharge to Snake River passing through Milner Dam. Former station
number for this gaging station, 13088000, represents combined flow to
Snake River from this site and from 13087505 Lower Milner Power
Plant, which began operation November 1992. Considerable water leaks
into the Snake River Plain aquifer above station. Diversions above
station for irrigation of about 1,990,000 acres, of which about
504,000 acres are irrigated by withdrawals from ground water, and
about 436,000 acres are irrigated below station. Return flow in large
part enters Snake River between Milner and King Hill stations. Prior
to 1993 water year, at times, practically entire flow was diverted
during irrigation season.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 26,300 ft³/s
June 22, 1997, gage height, 21.14 ft; minimum daily, 0.18 ft³/s Sept.