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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.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
06600100 Floyd River at Alton, IA
LOCATION - Lat 42°58'55", long 96°00'03" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 NE 1/4 sec.11, T.94 N., R.44 W., Sioux County, IA, Hydrologic Unit 10230002, on right bank 15 ft downstream from bridge on East Division Street in Alton, 34.3 mi upstream from West Branch Floyd River, and 55.3 mi upstream from mouth.
DRAINAGE AREA - 268 mi².
REVISIONS HISTORY - WDR IA-82-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records from October 1955 to current year. Prior to December 1955, monthly mean discharge published in WSP 1730.
GAGE - Datum of gage is 1,270.17 ft above NAVD 1988.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IA Water Science Center.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in June 1953, discharge about 45,500 ft³/s, from information by U.S. Army Corps of Engineers.
