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LOCATION.--Lat 43° 00'08", long 115° 12'06", in NW1/4 NW1/4 SW1/4 sec.7,
T.5 S., R.11 E., Elmore County, Hydrologic Unit 17040212, on right bank,
300 ft east of railroad tracks at King Hill, 20 mi downstream from Malad
River, and at mile 546.6.
DRAINAGE AREA.--35,800 mi2, approximately. Mean elevation, 6,040 ft.
PERIOD OF RECORD.--May 1909 to current year.
REVISED RECORDS.--WSP 1317: 1935(M). WDR ID-76-1: 1974.
GAGE.--Datum of gage is 2,492.3 ft above NGVD of 1929 (stadia levels).
Nonrecording gage May 13, 1909 to Mar. 1, 1910, on left bank at present
site at datum 2.20 ft higher, Mar. 7 to Aug. 16, 1910, 0.8 mi upstream
at different datum, and Aug. 17, 1910 to Oct. 7, 1928, at present site
and datum.
REMARKS.--Flow regulated by American Falls Reservoir, 168.4 mi upstream.
Diurnal fluctuation caused by hydroelectric plants upstream. At times,
practically entire flow is diverted at Milner during irrigation seasons;
only minor diversions below Milner; flow at King Hill is then derived
largely from springs and seepage entering below Milner. Diversions above
station for irrigation of about 2,450,000 acres, of which about 675,000 acres
are irrigated by withdrawals from ground water (1966 determination).
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge observed, 47,200 ft3/s
June 22, 1918, gage height, 16.3 ft, from rating curve extended above
30,000 ft3/s; minimum observed, 1,250 ft3/s Jan. 10, 1950, when flow was
cut for gage repairs, gage height, 1.75 ft;
minimum daily, 4,760 ft3/s June 7-9, Aug. 15, 16, 1910.
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