LOCATION.--Lat 43°01'37.3", long 91°10'21"
referenced to North American Datum of 1927, in SE 1/4 NE 1/4 SE 1/4
sec.22, T.95 N., R.3 W., Clayton County, IA, Hydrologic Unit
07060001, on right bank in city park at east end of Main Street in
McGregor, 2.6 mi upstream from Wisconsin River, 4.3 mi downstream
from Yellow River, and 633.4 mi upstream from Ohio River. (map)
DRAINAGE AREA.--67,500 mi2.
SURFACE-WATER RECORDS
PERIOD OF RECORD.--Discharge records from August 1936 to September
2005, October 2007 to current year; stage-only records from October
2005 to September 2007.
REVISED RECORDS.--WDR IA-75-1: 1974. WDR-US-2009: 2002.
GAGE.--Water-stage recorder. Datum of gage is 604.84 ft above
National Geodetic Vertical Datum of 1929. Auxiliary gage at Lock and
Dam 9 (station 05388410), 14.1 mi upstream, at datum 5.30 ft lower.
Prior to June 1, 1937, and since June 2, 1939, auxiliary water-stage
recorder; June 1, 1937, to June 1, 1939, non-recording auxiliary
gage.
REMARKS.--Minor flow regulation caused by navigation dams.
WATER-QUALITY RECORDS
PERIOD OF RECORD.--Water years 1975-2004.
PERIOD OF DAILY RECORD.--
SPECIFIC CONDUCTANCE: Daily instantaneous values collected in
conjunction with suspended-sediment samples, July 1975 to September
2004, records fragmentary.
WATER TEMPERATURES: Daily instantaneous values collected in
conjunction with suspended-sediment samples, July 1975 to September
2004, records fragmentary.
SUSPENDED-SEDIMENT CONCENTRATION AND DISCHARGE: July 1975 to
September 2004.
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