LOCATION.-- Lat 42°07'40", long 89°23'25" (NAD of 1927), in NW1/4NW1/4 sec.31, T.25 N., R.10 E., Ogle County, Hydrologic Unit 07090005, near left bank on downstream side of bridge on State Highway 72, 0.4 mi downstream from Chicago, Milwaukee, St. Paul and Pacific Railroad bridge, 0.6 mi east of town of Leaf River, and 0.8 mi downstream from Mud Creek.

DRAINAGE AREA.-- 102 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1939 to September 1958.

REVISED RECORDS.-- WSP 1508: 1940-41, 1943-44, 1945(M).

GAGE.-- Wire-weight gage and crest-stage indicator; gage read twice daily. Datum of gage is 685.64 ft above NGVD of 1929.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 6,510 ft³/s Feb. 27, 1948, gage height, 14.44 ft, from rating curve extended above 2,900 ft³/s; minimum observed, 7.6 ft³/s Jan. 5, 1940.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum stage known, 15.9 ft Feb. 4, 1938, from information by local residents.