LOCATION.-- Lat 40°07'12", long 88°11'41" (NAD of 1927), in NE1/4SW1/4 sec.9, T.19 N., R.9 E., Champaign County, Hydrologic Unit 05120109, on right bank at Champaign-Urbana sewage-disposal plant, 0.3 mi downstream from Boneyard Creek, 0.5 mi downstream from U. S. Highway 45, and 1 mi east of Urbana.

DRAINAGE AREA.-- 71.4 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: July 1936 to September 1958.

PARTIAL RECORD: Annual maximum, water years 1959 to 1975.

REVISED RECORDS.-- WSP 1143: 1937(M). WSP 1205: 1942(P).

GAGE.-- Water-stage recorder and concrete control. Datum of gage is 687.02 ft above NGVD of 1929 (686.89 ft NAVD 1988). Prior to July 8, 1941, at datum 1.00 ft higher.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3,140 ft³/s Mar. 12, 1939, gage height, 12.84 ft; minimum, 1.19 ft³/s Aug. 19, Oct. 20, 1936, Oct. 8, 1938.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum stage known, 13.5 ft. May 11, 1933, from floodmarks.