USGS Water-Year Summary 2020
05455700 Iowa River near Lone Tree, IA
LOCATION - Lat 41°25'25.6", long 91°28'42.7" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 NW 1/4 sec.06, T.76 N., R.5 W., Louisa County, IA, Hydrologic Unit 07080209, on left bank 30 ft downstream from tri-county bridge on County Highway W66, 5 mi southwest of Lone Tree, 6.2 mi downstream from English River, and 46.6 mi upstream from mouth.
DRAINAGE AREA - 4,293 mi².
PERIOD OF RECORD - Discharge records from October 1956 to current year.
GAGE - Water-stage recorder. Datum of gage is 588.16 ft above National Geodetic Vertical Datum of 1929. Prior to December 28, 1956, non-recording gage at same site and datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of May 25, 1944, reached a stage of 19.94 ft, from information by U.S. Army Corps of Engineers, discharge not determined.
PERIOD OF RECORD - Water years 2008, 2012.