LOCATION.-- Lat 41°00'50", long 90°44'45" (NAD of 1927), between secs. 20 and 21, T.12 N., R.3 W., Warren County, Hydrologic Unit 07080104, attached to downstream side of right bridge pier on State Highway 135 at north edge of Little York, 1.5 mi upstream from Davids Creek, and 6.7 mi upstream from mouth.

DRAINAGE AREA.-- 132 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1940 to October 1971.

PARTIAL RECORD: Annual maximum, water years 1972 to 1978; 1980 to current.

REVISED RECORDS.-- WSP 1175: 1944, 1948(M). WSP 1508: 1945.

GAGE.-- Crest-stage gage. Datum of gage is 574.27 ft above NGVD of 1929 (levels by Corps of Engineers) (574.05 ft NAVD 1988). Prior to Sept. 22, 1966, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 18,100 ft³/s, July 24, 1993, gage height, 18.76 ft; minimum observed, 1.0 ft³/s Aug. 28, 1941.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood in June 1924 reached a stage of 18.1 ft, from floodmark.