LOCATION.-- Lat 42°26'10", long 89°11'50" (NAD of 1927), in SE1/4SW1/4 sec.11, T.28 N., R.11 E., Winnebago County, Hydrologic Unit 07090003, near left bank on downstream side of highway bridge over mouth of Sugar River, 0.5 mi south of Shirland and 7.5 mi upstream from mouth.

DRAINAGE AREA.-- 2,540 mi², approximately.

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1939 to September 1958.

GAGE.-- Wire-weight gage read once daily. Datum of gage is 711.79 ft above NGVD of 1929 (levels by Corps of Engineers).

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge observed, 15,200 ft³/s Jan. 8, 1946, gage height, 16.72 ft; minimum daily discharge, 335 ft³/s Sept. 7, 14, 15, 1958; minimum gage height observed, 2.44 ft July 24, 1940.