LOCATION.--Lat 41°42'55.0", long 91°31'48.0" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 SE 1/4 sec.22, T.80 N., R.6 W., Johnson County, IA, Hydrologic Unit 07080208, on left bank 1,200 ft downstream from Coralville Dam control house, 4.3 mi northeast of Coralville Post Office, 2.3 mi upstream from Rapid Creek, and 80.6 mi upstream from mouth. (map)

DRAINAGE AREA.--3,115 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD.--Discharge records from October 1992 to current year.

GAGE.--Water-stage recorder. Datum of gage is 600.00 ft above National Geodetic Vertical Datum of 1929 (levels by U.S. Army Corps of Engineers).

REMARKS.--Flow regulated by Coralville Lake (station 05453510), 1,200 ft upstream, since September 17, 1958.

WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water years 2008, 2012.

U.S. Army Corps of Engineers - Rock Island District