Gear Up for an Active Summer with the 15th Annual Mackinaw Memorial Bridge Run! Being one of the only two unique opportunities runners' are allowed to run across the "Mighty Mac" will be this year on May 26, 2018. This is a unique opportunity as only two times a year runners are allowed to run the "Mighty Mac" ! The other possibility, being the Fall Colors Bridge Run held in October. Runners must register in advance and be able to run a minimum of 12 minutes per mile to race in the event. For more information call (231) 436-5664 or email to firstname.lastname@example.org.