USGS Water-Year Summary 2020
05455100 Old Mans Creek near Iowa City, IA
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.
DRAINAGE AREA - 201 mi².
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.
PERIOD OF DAILY RECORD -
NITRATE: May 2012 to November 2015, records fragmentary.
WATER TEMPERATURE: February 2012 to November 2015, records fragmentary.