USGS Water-Year Summary 2023
06483290 Rock River below Tom Creek at Rock Rapids, IA
LOCATION - Lat 43°25'23.3", long 96°09'53.7" referenced to North American Datum of 1983, in SW 1/4 NW 1/4 SE 1/4 sec.04, T.99 N., R.45 W., Lyon County, IA, Hydrologic Unit 10170204, on right bank 5 ft downstream from bridge on gravel road in Campbell Park near waterworks lift station, 200 ft east of intersection of Tama Street and South 9th Avenue in Rock Rapids, 1.1 mi downstream from Tom Creek, and 44.8 mi upstream from mouth.
DRAINAGE AREA - 853 mi².
- Revisions: Gage datum was updated to 1,308.76 ft NAVD88 on July 27, 2023, as determined by a GNSS Level II survey. Gage datum was previously published as 1,308.57 ft NGVD29 from levels.
PERIOD OF RECORD - Discharge records from May 2001 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,308.76 ft. above NAVD of 1988.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of April 8, 1969, reached a stage of 10.23 ft, discharge 29,000 ft³/s, at discontinued gaging station 1.4 mi upstream above Tom Creek (station 06483270).