LOCATION.-- Lat 42°29'21", long 87°55'35" (NAD of 1927), in SE1/4 sec.3, T.46 N., R.11 E., Lake County, Hydrologic Unit 07120004, on right bank at upstream side of Russell Road bridge, 0.3 mi west of Russell, 7.2 mi upstream from Mill Creek, and at mile 109.3.

DRAINAGE AREA.-- 123 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: July 1967 to current year.

STAGE: Water years 1994 to current year.

PARTIAL RECORD: Occasional low-flow measurements, water years 1961-63, and annual maximum gage heights, water years 1962-66.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-1991 and 1999 to 2001. Additional chemical data for water years 1959-60, 1964-69, 1971-77 are published in Water-Resources Investigations 78-22 and 79-23 as site G 08.

MISCELLANEOUS: Water years 1999-2000; contaminants in streambed sediment, Water years 1998 and 2000; contaminants in fish tissue, Water year 1998.

PRECIPITATION: October 1999 to current year.

BIOLOGICAL

ALGAE: Pigment and biomass, Water year 2000.

BENTHIC MACROINVERTEBRATES: Water years 1999-2001.

FISH: Water years 1999-2001.

HABITAT: Water years 1999-2001.

REVISED RECORDS.-- WDR IL-75-1: Drainage area. WDR IL-76-1: 1960-68(M), 1973(M).

GAGE.-- Water-stage recorder, phone telemeter, raingage, and crest-stage gage. Datum of gage is 662.00 ft above NGVD of 1929. Oct. 17, 1961 to June 29, 1967, crest-stage gage at left downstream side of bridge at datum 4.29 ft higher.

REMARKS.-- Collection, computation, and publication of precipitation data do not necessarily conform to standards used by the National Weather Service. Precipitation data could be subject to error for days with freezing and/or thawing of precipitation.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3,500 ft³/s, May 23, 2004, gage height, 11.09 ft, no flow, at times in most years.

PRECIPITATION: Maximum daily total, 3.55 in., June 12, 2000.