LOCATION.--Lat 42°34'19.2", long 92°37'05.8" referenced to North American Datum of 1983, in NW 1/4 SE 1/4 SE 1/4 sec.28, T.90 N., R.15 W., Butler County, IA, Hydrologic Unit 07080205, on right bank 5 ft downstream from bridge on County Highway T55, 0.2 mi north of New Hartford, and 9.9 mi upstream from mouth. (map)

DRAINAGE AREA.--347 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD.--Discharge records from October 1945 to current year. Prior to April 1948, monthly mean discharge for some periods published in WSP 1308.

REVISED RECORDS.--WSP 1438: Drainage area. WSP 1558: 1948-49. WSP 1708: 1947 (M).

GAGE.--Water-stage recorder. Datum of gage is 882.44 ft above National Geodetic Vertical Datum of 1929. Prior to July 14, 1959, non-recording gage at same site and datum.

WATER-QUALITY RECORDS

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

Advanced Hydrologic Prediction Service

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