Safety Zone; Straits of Mackinac, Mackinaw City, MI

Notice of proposed rulemaking.

The Coast Guard is proposing to establish a temporary safety zone for navigable waters within a 100-yard radius of the center span of the Mackinac Bridge, Straits of Mackinac, Mackinaw City, MI. The safety zone is needed to protect personnel, vessels, and the marine environment from a marine event involving swimmers under the bridge. This proposed rulemaking would prohibit persons and vessels from being in the safety zone unless authorized by the Captain of the Port Sector Northern Great Lakes or a designated representative. We invite your comments on this proposed rulemaking.

Comments and related material must be received by the Coast Guard on or before June 2, 2025.

You may submit comments identified by docket number USCG-2025-0259 using the Federal Decision-Making Portal at https://www.regulations.gov. See the “Public Participation and Request for Comments” portion of the SUPPLEMENTARY INFORMATION section for further instructions on submitting comments. This notice of proposed rulemaking with its plain-language, 100-word-or-less proposed rule summary will be available in this same docket.