LOCATION.-- Lat 41°15'19", long 88°06'20" (NAD of 1983), in SW1/4NW1/4 sec.17, T.32 N., R.10 E., Will County, Hydrologic Unit 07120001, at bridge on county road, and at mile 6.2.

DRAINAGE AREA.-- 103 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

PARTIAL RECORD: Annual maximum, water years 1966-70.

BIOLOGICAL

BENTHIC MACROINVERTEBRATES: Water year 2005.

GAGE.-- Nonrecording gage. Datum of gage is 553.12 ft above NGVD of 1929 (552.97 ft NAVD 1988).

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) invertabrate sampling techniques.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum stage, 4.42 ft, May 14, 1970, discharge unknown.

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 just east of the Wesley Road crossing in Ritchie. The surface area sampled was 1.25 m².