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USGS Water-Year Summary 2025
05464000 Cedar River at Waterloo, IA
LOCATION - Lat 42°29'43.96", long 92°20'03.65" referenced to North American Datum of 1983, in SE 1/4 NW 1/4 NW 1/4 sec.25, T.89 N., R.13 W., Black Hawk County, IA, Hydrologic Unit 07080205, on left bank near end of East 7th Street, 0.3 mi upstream from bridge on 11th Street in Waterloo, 1.1 mi downstream from Black Hawk Creek, and 162.3 mi upstream from mouth.
DRAINAGE AREA - 5,146 mi².
REVISIONS HISTORY - WSP 1438: Drainage area. WSP 1558: 1950.
Revisions: Gage datum was updated to 823.66 ft NAVD88 on January 3, 2023, as determined by a GNSS Level II survey. Gage datum was previously published as 824.14 ft NGVD29 from levels.
Revisions: Gage datum was updated to 823.66 ft NAVD88 on January 3, 2023, as determined by a GNSS Level II survey. Gage datum was previously published as 824.14 ft NGVD29 from levels.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records from October 1940 to current year. Prior to April 1941, monthly mean discharge for some periods published in WSP 1308.
GAGE - Water-stage recorder. Datum of gage is 823.66 ft above North American Vertical Datum of 1988.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IA Water Science Center. Minor diurnal fluctuations during periods of low flow due to operations of power plant located 30.3 mi upstream.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of March 16, 1929, reached a stage of about 20.0 ft, determined by U.S. Army Corps of Engineers, from information by city of Waterloo, discharge about 65,000 ft³/s. Flood of April 2, 1933, reached a stage of about 19.5 ft, from information by city of Waterloo, discharge about 61,000 ft³/s.
