Coast Guard closes waters near Mackinac Bridge for swim event

The Coast Guard has finalized a rule creating a temporary safety zone in the Straits of Mackinac, Michigan. The restriction covers all navigable waters within 100 yards of the center span of the Mackinac Bridge from 7 a.m. to noon on July 18, 2026.

Why it matters: This rule is a standard safety measure for large public water events. It ensures that boats do not endanger swimmers and that emergency access is maintained. The Coast Guard noted it received no public comments on the proposed rule, so the final version matches the original proposal exactly.

Who it affects

• Boat operators planning to transit the Straits of Mackinac between 7 a.m. and noon on July 18, 2026

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This rule was issued by the U.S. Coast Guard and published in the Federal Register on June 22, 2026; check the original document for full regulatory text.

Agency: Homeland Security Department, Coast Guard
Source: Federal Register — read the official document