LOCATION.-- Lat 42°10'58", long 88°38'28" (NAD of 1927), in SE1/4SW1/4 sec.22, T.43 N., R.5 E., McHenry County, Hydrologic Unit 07090006, on left bank at downstream side of bridge on Riley-Harmony Road, 0.2 mi upstream from Interstate Highway 90, 0.8 mi southwest of Riley, and at mile 12.8. | |
DRAINAGE AREA.-- 85.1 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: August 1961 to October 1982. | |
SURFACE-WATER QUALITY | |
CHEMICAL: Water years 1979-91. | |
REVISED RECORDS.-- WSP 2114: 1962(P), 1965(P). WDR IL-75-1: Drainage area. | |
GAGE.-- Water-stage recorder. Datum of gage is 792.96 ft above NGVD of 1929. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 5,090 ft3/s July 2, 1978, gage height, 9.73 ft; minimum, 0.70 ft3/s Oct. 23, 1966. | |