LOCATION.-- Lat 42°24'51", long 88°20'35" (NAD of 1927), in NW 1/4NE 1/4,sec. 6, T.45N., R.8 E., McHenry County, Hydrologic Unit 07120006, on left bank at upstream side of bridge on Barnard Mill Road, 2.0 mi North of Wonder Lake, 2.8 mi northwest of Ringwood, and at mile 16.5.

DRAINAGE AREA.-- 97.3 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: June 13, 1994 to September 30, 1997.

STAGE: July 1994 to October 1997.

PARTIAL RECORD: Annual maximum, water years 1965 to 1977.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1994-97.

SEDIMENT: June 1994 to June 1997.

MISCELLANEOUS: Sediment concentration and particle size, water years 1996-97.

GAGE.-- Water-stage recorder and crest-stage gage. Datum of gage is 776.00 ft above NGVD of 1929 (775.79 ft NAVD 1988). Prior to June 13, 1994, at datum 4.29 ft higher.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum gage height, 8.76 ft present datum, June 11, 1967, discharge not determined.

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 90 mg/L, Feb. 22, 1997; minimum daily, 3 mg/L, Nov. 30, Dec. 1, 1995.

SUSPENDED-SEDIMENT LOADS: Maximum daily, 238 tons, Feb. 22, 1997; minimum daily, 0.14 tons, Sept. 19, 1994.