USGS Water-Year Summary 2020
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.
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 945.50 ft above National Geodetic Vertical Datum of 1929.
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.