LOCATION.--Lat 43°02'27", long 91°12'23"
  referenced to North American Datum of 1927, in SE 1/4 SW 1/4 SW 1/4
  sec.16, T.95 N., R.3 W., Clayton County, IA, Hydrologic Unit
  07060001, on right bank 50 ft downstream from bridge on State Highway
  18, 1.5 mi west of Marquette, and 1.5 mi upstream from mouth.
  (map)
  DRAINAGE AREA.--34.1 mi2.
  SURFACE-WATER RECORDS
  PERIOD OF RECORD.--Discharge records from October 1991 to current
  year.
  GAGE.--Water-stage recorder. Datum of gage is 624.82 ft above
  National Geodetic Vertical Datum of 1929.