USGS Water-Year Summary 2023
05387500 Upper Iowa River at Decorah, IA
LOCATION - Lat 43°18'17.7", long 91°47'43.4" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 SW 1/4 sec.16, T.98 N., R.8 W., Winneshiek County, IA, Hydrologic Unit 07060002, on right bank 600 ft upstream from bridge on College Drive in Decorah, 0.8 mi downstream from Dry Run Creek Cutoff, 3.0 mi upstream from Trout Run, and 57.0 mi upstream from mouth.
DRAINAGE AREA - 511 mi².
PERIOD OF RECORD - Discharge records from August 1951 to September 1983, October 2002 to current year; annual maximum discharge, water years 1984-1988; stage-only records from October 1999 to September 2002.
GAGE - Water-stage recorder. Datum of gage is 850.07 ft above North American Vertical Datum of 1988.
EXTREMES OUTSIDE PERIOD OF RECORD - Since at least 1913, no flood outside the period of record exceeded that of May 29, 1941, at site of former gaging station near Decorah (station 05388000), 4 mi downstream, discharge 28,500 ft³/s.
PERIOD OF RECORD - Water years 1963-1965, 1967.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: Daily instantaneous values collected in conjunction with suspended-sediment samples, October 1962 to September 1964, October 1965 to April 1967, records fragmentary. Daily minimum/maximum, April 1967 to September 1983, records fragmentary.
SUSPENDED-SEDIMENT CONCENTRATION AND DISCHARGE: October 1962 to December 1967.