LOCATION.--Lat 41°36'23", long 91°36'56"
referenced to North American Datum of 1927, in SE 1/4 SW 1/4 NW 1/4
sec.36, T.79 N., R.7 W., Johnson County, IA, Hydrologic Unit
07080209, on left bank 10 ft downstream from bridge on County Highway
W62, 5.0 mi southwest of Iowa City, 5.9 mi upstream of Dirty Face
Creek, and 8.8 mi upstream from mouth. (map)
DRAINAGE AREA.--201 mi2.
SURFACE-WATER RECORDS
PERIOD OF RECORD.--Discharge records from October 1950 to
September 1964, October 1984 to current year; occasional low-flow
measurements, water years 1965-1977; annual maximum discharge, water
years 1965-1984. Prior to October 1963, daily mean discharge
published in WSP 1914.
GAGE.--Water-stage recorder. Datum of gage is 637.49 ft above
National Geodetic Vertical Datum of 1929. Prior to November 16, 1984,
non-recording gage; prior to October 1, 1987, at datum 2.00 ft
higher.
COOPERATION.--Gage height records and discharge measurements for
water years 1951-1964 were collected by the U.S. Army Corps of
Engineers and computed by the U.S. Geological Survey.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD.--
NITRATE: May 2012 to current year, records fragmentary.
WATER TEMPERATURE: February 2012 to current year, records
fragmentary.
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