The River Conservancy District Act is intended to facilitate "unified control of a lake or of a river system or a portion thereof" with respect to recreational use, water supply, flood control, or pollution. A single River Conservancy District can occupy area in multiple counties.
This list is a work in progress, and includes current and historic River Conservancy Districts. The number of River Conservancy Tax Districts in Illinois between 2013 and 2022 was 14 (Illinois Department of Revenue Property Tax Statistics, 2022 Number of Taxing Districts by Type, 2013--2022).