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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
05387440 Upper Iowa River at Bluffton, IA
LOCATION - Lat 43°24'25", long 91°53'56" referenced to North American Datum of 1927, in NW 1/4 NW 1/4 SE 1/4 sec.10, T.99 N., R.9 W., Winneshiek County, IA, Hydrologic Unit 07060002, on left bank 10 ft downstream from bridge on County Highway W20, 6.8 mi northwest of Decorah, 0.5 mi upstream from Silver Creek, and 73.9 mi upstream from mouth.
DRAINAGE AREA - 367 mi².
REVISIONS HISTORY - Revisions: Gage datum was revised to 944.65 ft NAVD88 on May 24, 2023, as determined by a GNSS Level II survey. Gage datum was previously published in error as 945.50 ft NGVD29.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Partial-record low-flow measurement site from September 1957 to July 1977; stage-only records from October 1999 to September 2002; discharge records from October 2002 to current year.
GAGE - Water-stage recorder. Datum of gage is 944.65 ft above North American Vertical Datum of 1988.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS CMWSC Water Science Center.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 21, 1954, discharge 13,600 ft³/s, on basis of peak flow at Decorah gage, 11.0 mi downstream. Flood of March 27, 1961, discharge 20,200 ft³/s.
