LOCATION.-- Lat. 42°24'50", long. 90°25'40" (NAD of 1927), in NE1/4NE1/4 sec. 24, T. 28 N., R. 1 W., Jo Daviess County, Hydrologic Unit 07060005, on Green Street Bridge in Galena, about 1,500 ft downstream from Hughlett Branch and 4 mi upstream from mouth.

DRAINAGE AREA.-- 192 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1934 to September 1938.

SURFACE-WATER QUALITY

CHEMICAL: Water year 1979-87.

GAGE.-- Wire-weight gage. Datum of gage is 580.56 feet above NGVD of 1929.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, about 11,400 ft³/s Feb. 21, 1937, gage height, 27.85 feet, from rating curve extended above 6,000 ft³/s; minimum discharge, 20 ft³/s July 11, 12, 30, Aug. 3, 9, 1936, Dec. 10, 11, 1938; minimum gage height observed, 7.90 ft Aug. 13, 1936.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: A stage of 25.0 ft (from high-water mark) occured Mar. 26, 1916 (discharge, about 6,200 ft³/s).