LOCATION.--Lat 41°49'38", long 90°11'25"
  referenced to North American Datum of 1927, in SW 1/4 SE 1/4 NW 1/4
  sec.18, T.81 N., R.7 E., Clinton County, IA, Hydrologic Unit
  07080101, at downstream end of ADM repair dock at end of 3rd Street,
  4.8 mi upstream from Clinton gage (station 05420500), 5.9 mi
  downstream from Lock and Dam 13, 10.3 mi upstream from Wapsipinicon
  River, and 516.6 mi upstream from Ohio River. (map)
  DRAINAGE AREA.--85,600 mi2.
  SURFACE-WATER RECORDS
  PERIOD OF RECORD.--Discharge records from October 1992 to current
  year.
  GAGE.--Water-stage recorder. Datum of gage is 562.68 ft above
  National Geodetic Vertical Datum of 1929.
  REMARKS.--Minor flow regulation caused by navigation dams.