LOCATION.--Lat 40°41'33", long 92°46'20"
  referenced to North American Datum of 1927, in NW 1/4 SW 1/4 NW 1/4
  sec.13, T.68 N., R.17 W., Appanoose County, IA, Hydrologic Unit
  10280201, on right bank 6 ft downstream from bridge on County Highway
  J45 (543rd Street), 5.0 mi west of Moulton, 0.7 mi downstream from
  Hickory Creek, 21.7 mi downstream from Rathbun Dam, and 8.4 mi
  upstream from Iowa-Missouri state line. (map)
  DRAINAGE AREA.--740 mi2.
  SURFACE-WATER RECORDS
  PERIOD OF RECORD.--Discharge records from August 1979 to current
  year.
  GAGE.--Water stage recorder. Datum of gage is 800.00 ft above
  National Geodetic Vertical Datum of 1929 (U.S. Army Corps of
  Engineers benchmark).
  REMARKS.--Flow regulated by Rathbun Reservoir (station 06903880),
  20.8 mi upstream, since November 21, 1969.