This great looking arch is one of the attractions of Mackinac Island State Park. It is located in Lake Huron east of the Mackinac Straits in the state of Michigan. It is accessible by ferry from St. Ignace or Mackinaw City, or by plane from the Pellston MI Airport. The opening has a height of 140 ft. and a span of 50 feet. Note the figures on the beach below the arch.