USGS Water-Year Summary 2023
05421740 Wapsipinicon River near Anamosa, IA
LOCATION - Lat 42°05'00.1", long 91°16'02.6" referenced to North American Datum of 1983, in SW 1/4 NW 1/4 SW 1/4 sec.13, T.84 N., R.4 W., Jones County, IA, Hydrologic Unit 07080103, on left bank 6 ft upstream from bridge on Shaw Road, 2.2 mi downstream from dam in Anamosa, 1.1 mi downstream from mouth of Dutch Creek and Fawn Creek, and 92.7 mi upstream from mouth.
DRAINAGE AREA - 1,575 mi².
REVISIONS HISTORY - Revisions: Gage datum was updated to 754.37 ft NAVD88 on September 15, 2022, as determined by a GNSS Level II survey. Gage datum was previously published as 755.00 ft NGVD29 from levels.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records from July 2002 to current year.
GAGE - Water-stage recorder. Datum of gage is 754.37 ft above North American Vertical Datum of 1988.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of July 21, 1968, discharge about 20,000 ft³/s, gage height 22.90 ft. Flood of May 18, 1999, gage height and discharge not determined.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 2008, 2012.