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.

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). 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 a stage of 17.4 ft, from floodmarks reported by local residents (discharge not determined).