If you're planning to cross the Mighty Mac as you head to the Upper Peninsula for Labor Day weekend, now's the time to start planning your road trip — and build in some time to reach the tip of the mitten.

The Mackinac Bridge towers over the Straits of Mackinac , providing the only link between Michigan 's Upper Peninsula and Lower Peninsula. Depending on what city you're coming from, the drive could take up to 4½ hours, so be sure to pack snacks and make bathroom stops along the way.

With Mackinaw City anchoring the south end and St. Ignace the north, the bridge spans the meeting point between Lake Michigan and Lake Huron , two of the region's five Great Lakes .

In May, the latest figures available, more than 374,000 vehicles crossed the bridge. More than 640,0

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