James J Duncker (Former Employee)

The U.S. Geological Survey (USGS) is conducting an Airborne ElectroMagnetic (AEM) Survey starting in late January 2023 and lasting three to four weeks. A helicopter towing a large hoop from a cable will begin making low-level flights over the Illinois River Basin, covering much of central Illinois and parts of northwest Indiana.

Surface water bodies in Cook County are used for stormwater detention, domestic and industrial uses, recreation, and commercial navigation. However, the bathymetry (elevation of the bottom surface) of most water bodies in Cook County has not been measured or mapped comprehensively. Similarly, water quality in most of these water bodies is unknown.

Approved Mean Annual Discharge The stream flow monitoring station on the Chicago Sanitary and Ship Canal near Lemont, Illinois has been in operation since December 7, 2004. The site is operated in cooperation with the U.S. Army Corps of Engineers, Chicago District, Chicago, Illinois. Link to Approved Mean Annual Discharge Link to Real-Time Gage Data: 05536890

To monitor fish movement in selected rivers, the USGS has installed near real-time receivers for fish tags. These receivers detect the presence of acoustic tags that have been surgically implanted into a variety of fish species. The tag detection data can provide information about how far fish are moving in a river system, changes in fish population distribution, and, when viewed with flow and...