LOCATION.-- Lat 42°01'00", long 89°19'44" (NAD of 1927), in NE1/4NW1/4, near center of sec.3, T.23 N., R.10 E., Ogle County, Hydrologic Unit 07090005, in tailrace of Illinois Northern Utilities Co.'s plant in Oregon, 1,000 ft upstream from bridge on State Highway 64, 2 mi upstream from Kyte River, and 110 mi upstream from mouth.

DRAINAGE AREA.-- 8,120 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1939 to September 1949.

SURFACE-WATER QUALITY

WATER TEMPERATURE: Water years 1975-77.

GAGE.-- Staff Gage. Datum of gage is 659.24 ft above NGVD of 1929 (levels by corps of Engineers).

REMARKS.-- Some diurnal regulation caused by power plants above station.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 45,500 ft³/s Jan. 6, 1946, gage height, 15.00 ft; minimum daily, 948 ft³/s July 28, 1946.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Highest stage known, 18.7 ft in February 1937, from floodmark.