USGS Water-Year Summary 2021
07143665 LITTLE ARKANSAS RIVER AT ALTA MILLS, KS
LOCATION - Lat 38°06'44", long 97°35'30" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 NW 1/4 sec.30, T.22 S., R.2 W., Harvey County, KS, Hydrologic Unit 11030012, on right bank at downstream side of county highway bridge, 0.4 mi south of Alta Mills, 0.8 mi downstream from Sand Creek, and at mile 50.1.
DRAINAGE AREA - 736 mi² of which 55 mi² probably is noncontributing.
- WDR KS-74-1: 1974(M). KS-80-1: 1980(M). KS-86-1: 1986(M).
PERIOD OF RECORD - June 1973 to current year.
GAGE - Water-stage recorder. Current datum of gage is 1,392.04 ft. above mean sea level (NAVD88). Old datum was 1,391.40 ft. above NGVD of 1929.
EXTREMES FOR PERIOD OF RECORD
Flood of Oct. 31, 1979 reached a gage-height of 27.34 ft. with a corresponding discharge of 29,300 cfs.
Flood of July 14, 1993 reached a gage-height of 27.30 ft. with a corresponding discharge of 21,000 cfs.
Flood of Nov. 2, 1998 reached a gage-height of 25.87 ft. with a corresponding discharge of 17,300 cfs.
Flood of May 7, 2019 reached a gage-height of 25.81 ft. with a corresponding discharge of 11,400 cfs.