LOCATION.-- Lat 42°17'34", long 88°59'23" (NAD of 1927), in NE1/4NW1/4 sec.10, T.44 N., R.2 E., Winnebago County, Hydrologic Unit 07090005, on left bank at downstream side of an abandoned bridge on Trainer Road, on east boundary of Rock Valley College, 5.8 mi northeast of City Hall Building in Rockford and at mile 4.92.

DRAINAGE AREA.-- 2.81 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: June 1979 to October 1981.

SURFACE-WATER QUALITY

SEDIMENT: June 1979 to September 1981.

GAGE.-- Water-stage recorder. Wooden weir since Oct. 19, 1979. Datum of gage is 853.52 ft above NGVD of 1929.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 623 ft³/s June 13, 1981, gage height, 10.92 ft; no flow for many days in most years.

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 2,640 mg/L June 13, 1981; minimum daily mean, 2 mg/L Nov. 12, 1980.

SUSPENDED-SEDIMENT LOADS: Maximum daily, 2,690 tons June 13, 1981; minimum daily, 0 ton on many days each year.