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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
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USGS Water-Year Summary 2024
04118000 Thornapple River near Caledonia, MI
LOCATION - Lat 42°48'40", long 85°29'00" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 sec.22, T.5 N., R.10 W., Kent County, MI, Hydrologic Unit 04050007, on right bank 200 ft downstream from LaBarge powerplant, 200 ft upstream from 84th Street, 2.3 mi northeast of Caledonia, and 3.3 mi downstream from Coldwater River.
DRAINAGE AREA - 773 mi².
REVISIONS HISTORY - WSP 1307: 1931-37.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1930 to September 1938 (monthly discharge only, published in WSP 1307; figures of daily discharge for these years may be unreliable and should not be used), October 1951 to March 1982, October 1983 to September 1994 (operated as a continuous-record gaging station), water years 1995 to current year.
GAGE - Water-stage recorder. Datum of gage is 675.89 ft above NAVD 88, converted on July 9, 2020 from NGVD 29 (Consumers Power Co. bench mark). Oct. 1, 1930 to Sept. 30, 1938, nonrecording gage at same site and datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Apr. 7, 1947, reached a stage of 14.4 ft, from information by powerplant operator.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 7,560 ft³/s, Feb. 24, 2018, gage height, 11.79 ft; minimum (water years 1931-38, 1952-82, 1984-94), 1.0 ft³/s, May 28, 1968, gage height, 1.40 ft, result of regulation during bridge construction.
