LOCATION.-- Lat 41°08'46", long 88°05'59" (NAD of 1983), in SE1/4 SE1/4 SW1/4 sec.20, T.31N., R.10E., Kankakee County, Hydrologic Unit 07120001, at County Road 2000N, west of Bonfield, and at mile 10.5

DRAINAGE AREA.-- 45.4 mi².

PERIOD OF RECORD.--

BIOLOGICAL

BENTHIC MACROINVERTEBRATES: Water year 2005.

REMARKS.-- Biology station established in 2005 as part of a comparative study of the National Water-Quality Assessment (NAWQA) program and the U.S. Environmental Protection Agency's Environmental Monitoring and Assessment Program (EMAP) invertebrate sampling techniques.

REMARKS FOR CURRENT YEAR.--Benthic macroinvertebrate community samples were collected as part of a comparability study for 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). A Slack sampler was used to collect five subsamples from coarse-grained substrates in flowing water. The sampler had a sampling area of 0.25 m² and was fitted with a 500 µm mesh net. 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 was located at the CR2000N bridge crossing west of Bonfield. The surface area sampled was 1.25 m².