LOCATION.-- Lat 41°15'19", long 89°00'44" (NAD of 1927), in NE1/4SE1/4 sec.8, T.32 N., R.2 E., La Salle County, Hydrologic Unit 07130002, near center of span on downstream side of bridge on State Highway 178, 0.2 mi north of Lowell and 10 mi upstream from mouth.

DRAINAGE AREA.-- 1,230 mi², approximately.

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1931 to September 1971.

REVISED RECORDS.-- WSP 745: 1931-32. WSP 1308: 1932(M), 1935-38(M), 1940(M), 1942(M).

GAGE.-- Nonrecording gage. Datum of gage is 500.61 ft above NGVD of 1929 (500.42 ft NAVD 1988). Prior to Aug. 20, 1952, at site 500 ft downstream at same datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 33,500 ft³/s July 15, 1958, gage height, 15.30 ft, from graph based on gage readings; minimum, 5.0 ft³/s Feb. 1-5, 1961, Dec. 21-24, 1963.