LOCATION.-- Lat 40°48'02", long 89°48'01" (NAD of 1927), in SW1/4SE1/4 sec.34, T.10 N., R.6 E., Peoria County, Hydrologic Unit 07130003, at bridge on U.S. Highway 150, 0.8 mi upstream from mouth of the West Fork of Kickapoo Creek and 2.5 mi northwest of Kickapoo.

DRAINAGE AREA.-- 119 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1944 to September 1962.

PARTIAL RECORD: Annual maximum, water years 1963 to current year.

BIOLOGICAL: Benthic macroinvertebrates, water year 1997.

GAGE.-- Crest-stage gage. Datum of gage is 514.85 ft. above NGVD of 1929 (Corps of Engineers benchmark). Prior to June 7, 1945, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 27,500 ft³/s, July 27, 1967, gage height, 17.08 ft, from rating curve extended above 7,300 ft³/s; minimum, 0.4 ft³/s Oct. 28, 29, 1946, July 30 to Aug. 1, 1956.

REMARKS FOR CURRENT YEAR.--Benthic macroinvertebrate community samples were collected as part of the National Water-Quality Assessment program (NAWQA) in the lower Illinois River Basin. One quantitative (Richest-Targeted Habitat) sample was 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 425µm mesh net, and invertebrates were washed or 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. The reach begins 95 meters downstream from the bridge at US Route 150, west of Kickapoo. The surface area sampled at reach A was 0.27 m².