LOCATION.-- Lat 40°11'30", long 89°21'40" (NAD of 1927), in NE1/4NW1/4 sec.18, T.20 N., R.2 W., Logan County, Hydrologic Unit 07130009, on left bank at downstream side of highway bridge, 1,000 ft upstream from Illinois Terminal Electric Railroad, 3 mi north of Lincoln, and 7.5 mi upstream from mouth.

DRAINAGE AREA.-- 306 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1944 to October 1971.

PARTIAL RECORD: Annual maximum, water years 1972 to 1992.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-91.

MISCELLANEOUS: Contaminants in streambed sediments, July 1997; contaminants in fish tissue, July 1997.

REVISED RECORDS.-- WSP 1175: 1949(M).

GAGE.-- Water-stage recorder. Datum of gage is 557.08 ft above NGVD of 1929 (Corps of Engineers bench mark) (556.81 ft NAVD 1988). Prior to Sept. 18, 1945, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 7,970 ft³/s Apr. 21, 1964 (gage height, 13.17 ft); maximum gage height, 13.68 ft May 16, 1968; minimum discharge, 0.4 ft³/s Oct. 10, 11, 12, 1963.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood of July 6, 1929, reached an estimated stage of 17.4 ft, from floodmarks reported by local residents, and an estimated discharge of 14,000 ft³/s. Flood of May 18, 1943 reached a stage of 14.6 ft, and an estimated discharge of 9,000 ft³/s.