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

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, 2,130 ft³/s, June 14, 2000, gage height, 9.95 ft, maximum gage height, 10.75 ft, Mar. 6, 1976, and Sept. 27, 1986; no flow, at times in most years.

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

REMARKS FOR CURRENT YEAR.--Benthic macroinvertebrate community samples were collected during 2001 as part of the National Water-Quality Assessment program (NAWQA) in the upper Illinois River Basin. One quantitative sample and one qualitative multihabitat sample were collected in accordance with the NAWQA protocols (Cuffney and others, 1993). The quantitative sample was a composite of macroinvertebrates from about 10 submerged tree branches. Branches were cut underwater, gathered in a 425 µm mesh net, and invertebrates were washed and picked from the branches. The average length and average diameter of each branch were measured and used to calculate an approximate surface area. All samples were processed by the USGS National Water-Quality Laboratory. Phylum, Class, Order, Suborder, Family, Subfamily, and Tribe are listed and arranged according to the USGS National Water-Quality Laboratory taxonomic hierarchy. Reach A begins 295 ft. upstream of the Russell Rd bridge and continues upstream for 656 ft. The surface area sampled at reach A was 0.26 m².