LOCATION.--Lat 42°43'25", long 94°11'35.7" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 SE 1/4 sec.6, T.91 N., R.28 W., Humboldt County, IA, Hydrologic Unit 07100003, on right bank 50 ft upstream from old mill dam in city park, at eastern edge of Dakota City, 500 ft upstream from bridge on County Highway P56, 0.6 mi downstream from bridge on State Highway 3, 3.7 mi upstream from confluence with Des Moines River, and 322.6 mi upstream from mouth of Des Moines River. (map)

DRAINAGE AREA.--1,308 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD.--Discharge records from March 1940 to current year. Prior to October 1954, published as "near Hardy".

REVISED RECORDS.--WSP 1438: Drainage area. WSP 1508: 1944, 1945-47 (M).

GAGE.--Water-stage recorder. Datum of gage is 1,038.71 ft above National Geodetic Vertical Datum of 1929. Prior to October 1, 1954, non-recording gage at site 8 mi upstream at datum 20.59 ft higher.

Advanced Hydrologic Prediction Service

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