USGS Water-Year Summary 2020
05421000 Wapsipinicon River at Independence, IA
LOCATION - Lat 42°27'49", long 91°53'42" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 SE 1/4 sec.04, T.88 N., R.9 W., Buchanan County, IA, Hydrologic Unit 07080102, on right bank at end of 6th Street in Independence, 1,800 ft downstream from dam at abandoned hydroelectric plant, 4.9 mi downstream from Otter Creek, 9.7 mi upstream from Pine Creek, and 158 mi upstream from mouth.
DRAINAGE AREA - 1,048 mi².
- WSP 1438: Drainage area. WSP 1508: 1938-1939, 1940(M), 1947.
PERIOD OF RECORD - Discharge records from July 1933 to current year.
GAGE - Water-stage recorder and concrete control. Datum of gage is 882.85 ft above National Geodetic Vertical Datum of 1929. Prior to May 24, 1941, non-recording gage in tailrace of power plant, 1,800 ft upstream, at datum 80.00 ft lower.
EXTREMES OUTSIDE PERIOD OF RECORD - Since at least 1901, no flood outside the period of record exceeded the June 14, 1947, stage of 18.74 ft.
PERIOD OF RECORD - Water years 1968-1970, 2012.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Daily instantaneous values collected in conjunction with suspended-sediment samples, October 1968 to September 1970.
WATER TEMPERATURE: Daily instantaneous values collected in conjunction with suspended-sediment samples, October 1967 to September 1970.
SUSPENDED-SEDIMENT CONCENTRATION AND DISCHARGE: December 1967 to September 1970.