LOCATION.--Lat 42°13'37", long 96°04'40" referenced to North American Datum of 1927, in NE 1/4 NE 1/4 NE 1/4 sec.33, T.86 N., R.45 W., Woodbury County, IA, Hydrologic Unit 10230004, on left bank on upstream side of bridge on State Highway 141, 1.0 mi east of Hornick, and 9.2 mi upstream from Wolf Creek. (map)

DRAINAGE AREA.--403 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD.--Discharge records from April 1939 to September 1969 (published as "at Holly Springs"), July 1974 to September 2008, January 2010 to current year; annual maximum discharge, water year 2009.

GAGE.--Water-stage recorder. Datum of gage is 1,045.82 ft above National Geodetic Vertical Datum of 1929.

REMARKS.--West Fork Ditch is a dredged channel which diverts the flow of the West Fork Little Sioux River at Hornick south for 5.5 mi, then southeast for 6.5 mi to a point 1.2 mi west of Kennebec, where Wolf Creek enters from the east. From this point, the ditch roughly parallels the Little Sioux River and is known as the Monona-Harrison Ditch.

WATER-QUALITY RECORDS

PERIOD OF DAILY RECORD.--
SUSPENDED-SEDIMENT DISCHARGE: April 1939 to June 1941, August 1957 to November 1959, April to November 1960, April to November 1961, April to November 1962, April to November 1963, March 1964 to January 1965, March 1965 to September 1967, records provided by U.S. Army Corps of Engineers.

Advanced Hydrologic Prediction Service

National Streamflow Information Program