 In 1986, US 10 was truncated to Bay City, removing its concurrency with I-75 from there to Clarkston.Two years later, the original bascule Zilwaukee Bridge across the Saginaw River was replaced by a much higher structure slightly north of the former bridge.All of I-75 within Michigan was named the Tuskegee Airmen Memorial Highway, in honor of the Tuskegee Airmen, at the end of December 2014.