Mackinac Bridge, Marvel of Construction, Michigan - Photo by Lucy Gridley - Vintage Postcard column_of_liberty James Whitcomb Riley's Residence

James Whitcomb Riley's Residence

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San Francisco Bay 1936 -Bird's Eye View of Alcatraz Prison - Bardell H-Gloss Print

Mackinac Bridge, Marvel of Construction, Michigan - Photo by Lucy Gridley - Vintage Postcard column_of_liberty James Whitcomb Riley's ResidenceOn front: A photo of the Mackinac Bridge, Photo: Lucy Gridley On back: Marvel of Construction Spanning the heavily travelled Straits of Mackinac, and connecting Michigans Upper Peninsula to the Great Peninsula at Mackinaw City, and St. Ignace, the magnificent bridge was engineered to withstand many times the recorded stresses of ice pressure, wind, velocity and gravity. Overall length of the bridge is 5 miles; center span 3800 feet between the 565 ft.