The chances of getting breast cancer increase with age, and the disease is much more likely after age 50 than before. So, from a public health and cost-effectiveness perspective, annual screening mammograms do the most good after age 50.
Mackinac Bridge. Mackinac Bridge. The Mackinac Bridge is located on Interstate 75 in northern Michigan at the Straits of Mackinac.The iconic bridge connects Michigan's upper and lower peninsulas. Mackinaw City is located at the south end of the bridge, while St. Ignace is located at the north end.
Mackinac Island Tourism Bureau. Getting to Mackinac Island. Interstate I-75 brings you to the ferry docks of both Mackinaw City (Lower Peninsula) and St. Ignace (Upper Peninsula). Access to the island can be made from both of these cities. The exits are clearly marked for several miles.