USGS Water-Year Summary 2023
06605850 Little Sioux River at Linn Grove, IA
LOCATION - Lat 42°53'46.7", long 95°14'34.8" referenced to North American Datum of 1983, in SW 1/4 SE 1/4 SW 1/4 sec.05, T.93 N., R.37 W., Buena Vista County, IA, Hydrologic Unit 10230003, on right bank 500 ft upstream from concrete dam, 1,300 ft upstream from bridge on County Highway M36 in Linn Grove, and 139.4 mi upstream from mouth.
DRAINAGE AREA - 1,548 mi².
- WDR IA-80-1: 1978-1979.
PERIOD OF RECORD - Discharge records from October 1972 to current year.
- Water-stage recorder.
Datum of gage is 1,223.87 ft. above NAVD of 1988.
October 1, 1972, to November 17, 1999, water-stage recorder located 0.25 mi downstream below concrete dam at same datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 10, 1953, reached a stage of 20.96 ft, discharge 22,500 ft³/s.