LOCATION.--Lat 41°46'01", long 90°32'05"
referenced to North American Datum of 1927, in NE 1/4 SW 1/4 NE 1/4
sec.6, T.80 N., R.4 E., Clinton County, IA, Hydrologic Unit 07080103,
on left bank 5 ft upstream from bridge on State Highway 956, 4.0 mi
south of water tower in De Witt, 0.9 mi downstream from Silver Creek,
6.2 mi upstream from Brophy Creek, and 18.2 mi upstream from mouth.
(map)
DRAINAGE AREA.--2,336 mi2.
SURFACE-WATER RECORDS
PERIOD OF RECORD.--Discharge records from July 1934 to current
year.
REVISED RECORDS.--WSP 1308: 1937 (M). WSP 1438: Drainage area. WSP
1708: 1951.
GAGE.--Water-stage recorder. Datum of gage is 598.81 ft above
National Geodetic Vertical Datum of 1929.
WATER-QUALITY RECORDS
PERIOD OF RECORD.--Water years 2004 to current year.