Mackinac Bridge Info   The famous bridge spans the two peninsulas of Michigan and connects Mackinaw City with St. Ignace.  This bridge, which "couldn't be built", is  five miles long and is the worlds longest total suspension bridge.   It is on Labor Day only that any foot travel is allowed for the thousands of walkers who make the trip from St. Ignace to Mackinaw City each year. The magnificent view from the bridge includes both peninsulas and Mackinac, Round, and Bois Blanc islands.   Mackinac Links of Interest Mackinac Bridge Turns 50  * Get ready to party and celebrate the Mackinac Bridge 50th birthday. 10 people who helped make the Mackinac Bridge a reality  * Find out who put it all together Mackinac Bridge Authority Website  * Historical background about the bridge, which connects the upper and lower peninsulas of Michigan