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Publication Abstract

Illinois Lake Quality Assessment-1992 Lin, Shun Dar, and Raman K. Raman, 1993  Illinois State Water Survey, Champaign, IL,  ISWS CR-553    Full Text Available
The State of Illinois has more than 2,900 lakes and reservoirs with surface areas of six acres or more. The origins of these water impoundments vary. Some were formed by glaciers, but most were developed by damming streams. More than 90 of them serve as raw water-supply sources, and a few are used for industrial cooling. All are used for recreational swimming, fishing, boating, and water-skiing.

Approximately 500 lakes and reservoirs have been assessed by the Illinois Environmental Protection Agency (IEPA) as part of the Clean Water Act goal and use-support attainment. To increase the number of lakes studied, the IEPA has applied for and received funds from the U.S. Environmental Protection Agency Region V under Section 314 Federal Clean Lakes Program, Lake Water Quality Assessment (LWQA) grants. The IEPA used funds awarded under the LWQA grants to assess additional lakes for which little or no lake data were readily available, such as this 1992 project.

To fulfill IEPA’s goal, the Illinois State Water Survey (ISWS) collected data on 25 selected lakes throughout the state. The ISWS staff visited these lakes, collected water and sediment samples, and obtained lake assessment information. This report presents all data for the 25 lakes.

Data are presented as individual listings and maps. Each summary contains a lake map, morphological data, watershed information, information on lake impairments and water-quality problems, analytical results of lake water and sediment qualities, and the lake trophic status. Only results of physical and chemical characteristics of lake water samples are discussed. On the basis of only one observation for each lake, four lakes (Strode Lake, Shovel Lake/Banner Marsh, Fitch Lake, and Johnson Lake/Banner Marsh) have the highest water quality. Four other lakes (Nashville City Reservoir, Avondale Lake, Oakland City Lake, and Greenfield Lake) have poor water quality yet serve as public water-supply sources. Further investigation of the four lakes with poor water quality is recommended.

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