USGS Water-Year Summary 2020
05473450 Big Creek North of Mount Pleasant, IA
LOCATION - Lat 41°00'25", long 91°33'05" referenced to North American Datum of 1927, in SE 1/4 NW 1/4 SE 1/4 sec.28, T.72 N., R.6 W., Henry County, IA, Hydrologic Unit 07080107, on right bank 20 ft upstream from bridge on Old U.S. Highway 218 (business route), 2.0 mi north of Mount Pleasant, 1.6 mi upstream from Brandy Wine Creek, 2.3 mi upstream from Lynn Creek, and 27.4 mi upstream from mouth.
DRAINAGE AREA - 58 mi².
PERIOD OF RECORD - Occasional low-flow measurements, water years 1957-1977; discharge records from October 1997 to current year. Prior to October 2008, published as "near Mt. Pleasant".
GAGE - Water-stage recorder. Datum of gage is 643.00 ft above National Geodetic Vertical Datum of 1929.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of April 21, 1973, discharge 9,580 ft³/s, on basis of contracted-opening measurement.
PERIOD OF RECORD - Water year 2008.