USGS Water-Year Summary 2020
05462000 Shell Rock River at Shell Rock, IA
LOCATION - Lat 42°42'43", long 92°34'58" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 NE 1/4 sec.11, T.91 N., R.15 W., Butler County, IA, Hydrologic Unit 07080202, on right bank 400 ft upstream from bridge on County Highway C45 in Shell Rock, 2.2 mi downstream from Curry Creek, and 10.7 mi upstream from confluence with West Fork Cedar River.
DRAINAGE AREA - 1,746 mi².
- WSP 1438: Drainage area.
PERIOD OF RECORD - Discharge records from June 1953 to current year.
GAGE - Water-stage recorder. Rockfill dam since October 19, 1957. Datum of gage is 885.34 ft above National Geodetic Vertical Datum of 1929.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in 1856 reached a stage of 17.7 ft, at bridge 400 ft downstream, from information by U.S. Army Corps of Engineers, discharge about 45,000 ft³/s.
PERIOD OF RECORD - Water years 1988, 2001-2002, 2004, 2011-2012. Period of record includes water-quality data published in USGS annual reports and various project reports.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Daily maximum/minimum, June 1953 to September 1968.