LOCATION.--Lat 43°03'44.0", long 92°40'25.3" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 NE 1/4 sec.12, T.95 N., R.16 W., Floyd County, IA, Hydrologic Unit 07080201, on right bank 800 ft downstream from bridge on U.S. Highway 18 (Brantingham Street) in Charles City, 10.6 mi upstream from Gizzard Creek, and 231.3 mi upstream from mouth. (map)

DRAINAGE AREA.--1,054 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD.--Discharge records from October 1964 to September 1995, October 2000 to current year; stage-only records from October 1995 to September 2000.

GAGE.--Water-stage recorder. Datum of gage is 973.02 ft above National Geodetic Vertical Datum of 1929.

REMARKS.--Occasional minor regulation caused by dam 0.2 mi upstream. Daily wire-weight gage-height readings available for period September 13, 1945, to June 30, 1954, at same site and datum. Discharge not published for this period because of extreme regulation of streamflow by dam.

WATER-QUALITY RECORDS

PERIOD OF RECORD.--Water years 1988, 1995, 2001-2002, 2011-2012. Period of record includes water-quality data published in USGS annual reports and various project reports.

Advanced Hydrologic Prediction Service

National Streamflow Information Program