The swim runs 4.5 miles across the Straits of Mackinac, where Lake Michigan and Lake Huron meet, per the event website. Participants must swim along the east side of the bridge and within 100 ...

The upcoming Mackinac Bridge Swim is a fundraiser for first responders. Dedicated swimmers traverse the 4.5 mile Straits of Mackinac, according to the event's website. Here's what to know.

The start of the Mackinac Bridge Swim in Mackinaw City, Mich. on Saturday, July 26, 2025. 266 swimmers took on the 4.5-mile swim for charity across the Straits of Mackinac, all swimmers made it to ...