Michigan has officially added "don't climb the Mackinac Bridge" to the list of laws that somehow needed to be written down. Governor Gretchen Whitmer signed Senate Bill 71 on July 23, designating the nonpublic portions of the Mackinac Bridge as a protected "key facility."
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That puts restricted bridge areas in the same legal category as refineries, power plants, water treatment facilities, and other infrastructure where unauthorized visitors are generally frowned upon, especially when they arrive carrying nothing but terrible judgment.
What Counts as Mackinac Bridge Trespassing?
This does not make driving across the bridge or participating in a lawful assembly illegal. The law targets people who intentionally enter or remain in areas not open or intended for public use without permission.

To qualify under Michigan's key-facility law, the restricted area must be enclosed by a physical barrier, including water, and posted with visible no-entry signs. Trespassing can bring up to four years in prison, a $2,500 fine, or both. Peaceful protests and lawful assemblies remain protected.
Why Michigan Passed the New Bridge Law
The push followed a 2020 incident in which an Ohio man (of course) climbed the bridge's south tower at night without safety equipment and took photos. Officials discovered the existing charge was only a misdemeanor because a judge determined the bridge did not meet the old enclosure requirements.
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Bridge officials say the tougher penalty is meant to deter thrill-seekers and anyone with bad intentions. Translation: admire the Mighty Mac from your car. Your Instagram account doesn't need a felony charge.
Connecting the State: Making the Mackinac Bridge
Gallery Credit: Scott Clow

