The Coast Guard is establishing a temporary safety zone for navigable waters on the Detroit River, Detroit, MI. The safety zone is necessary and intended to protect personnel, vessels, and the marine environment from potential falling hazards created by the construction of the Gordie Howe Bridge. Entry of vessels or persons into this zone is prohibited unless specifically authorized by the Captain of the Port Detroit, or his designated representative.
Source: Federal Register USCG
Link: Safety Zone; Gordie Howe Bridge Construction, Detroit River; Detroit, MI