The Coast Guard is establishing a temporary safety zone on the waters of the Illinois River from mile markers 87.1 to 87.7. The safety zone is to protect personnel, vessels, and the marine environment from potential hazards created by extreme shoaling. Entry of vessels or persons into the zone is prohibited unless specifically authorized by the Captain of the Port, Sector Upper Mississippi River, or a designated representative.
Source: Federal Register USCG
Link: Safety Zone; Illinois River, Mile Marker 87.1 to 87.7