LOCATION.--Lat 42°32'05.6", long 96°24'37.5" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 SE 1/4 sec.8, T.89 N., R.47 W., Woodbury County, IA, Hydrologic Unit 10230001, on left bank on downstream side of bridge on 38th Street in Sioux City, 1.9 mi downstream from West Branch, and 4.2 mi upstream from mouth. (map)

DRAINAGE AREA.--65.1 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD.--Discharge records from October 1945 to September 1969, June 1981 to September 2004; stage-only records from October 2004 to current year.

REVISED RECORDS.--WSP 1440: Drainage area. WDR IA-95-1: River mile.

GAGE.--Water-stage recorder. Datum of gage is 1,112.04 ft above National Geodetic Vertical Datum of 1929 (Sioux City benchmark). Prior to May 20, 1954, non-recording gage with supplementary water-stage recorder in operation above 5.0 ft gage height, and May 20, 1954, to September 30, 1969, water-stage recorder, both at datum 5.0 ft higher.

Advanced Hydrologic Prediction Service

City of Sioux City

Cooperative Water Program