LOCATION.--Lat 41°20'14", long 93°29'10" referenced to North American Datum of 1927, in NE 1/4 SW 1/4 SE 1/4 sec.34, T.76 N., R.23 W., Warren County, IA, Hydrologic Unit 07100008, on right bank 15 ft downstream from bridge on 168th Avenue, 2.2 mi southwest of Ackworth, 0.5 mi downstream from Otter Creek, and 13.7 mi upstream from mouth. (map)

DRAINAGE AREA.--460 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD.--Discharge records from March 1940 to current year.

REVISED RECORDS.--WSP 1438: Drainage area. WSP 1508: 1941, 1945 (M), 1946.

GAGE.--Water-stage recorder. Datum of gage is 769.97 ft above National Geodetic Vertical Datum of 1929. Prior to June 12, 1946, and April 14, 1960, to September 30, 1961, non-recording gage, and June 12, 1946, to April 13, 1960, water-stage recorder, all at site 4.0 mi downstream at datum 8.06 ft lower.

Advanced Hydrologic Prediction Service

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

Iowa Department of Transportation

Cooperative Water Program