Water-Quality Assessment of the upper Illinois River Basin in Illinois, Indiana, and Wisconsin -- Results of Investigations through April 1992

U.S. Geological Survey Water-Resources Investigations Report 96-4223

Upper Illinois River Basin NAWQA

Water-Quality Assessment of the upper Illinois River Basin in Illinois, Indiana, and Wisconsin -- Results of Investigations through April 1992

NAWQA foreword
Abstract
Introduction

Background
Purpose

Description of the Upper Illinois River Basin

Surface-Water Hydrology and Climate, 1987-90
Water Use, 1987-90

Summary of Sampling Programs, April 1987-April 1992
Water-Quality Conditions (1987-91) and Trends (1978-91) in the Upper Illinois River Basin

Trace Inorganic Constituents
Organic Compounds
Nutrients, Dissolved Oxygen, and Fecal-Indicator Bacteria

Results of Studies and Implications for the National Water-Quality Assessment Program

Availability and Suitability of Information on Municipal Wastewater-Treatment Practices for Large-Scale Water-Quality Assessments
Evaluation of the Effects of Changes in Wastewater-Treatment Practices on Stream-Water Quality
Fish-Community Composition and Structure as a Measure of Water-Quality Conditions

Summary
References
Appendix: Selected Water-Sampling Stations Included in the Water-Quality Assessment of the Upper Illinois River Basin, 1987-92

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