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State Archivist Mark Harvey of the Michigan History Center talks with Stateside host Cynthia Canty on Michigan Radio about the history of the Mackinac Bridge.

Map from 1933 of a general plan for the Mackinac Bridge, including a causeway to Round Island and Boise Blanc Island.

Map from 1933 of a general plan for the Mackinac Bridge, including a causeway to Round Island and Boise Blanc Island.

Map from 1933 of a general plan for the Mackinac Bridge, including a causeway to Round Island and Boise Blanc Island.

Hand drawn survey map of the public access site on Quincy Lake in Ovid Township of Branch County, Michigan for the year 1972. The scale on the original is 1 inch equals 60 feet.

Hand drawn waxed linen map of the village of Muir in Ionia County, Michigan in 1939. This map was done as part of a Works Progress Administration project. The scale on the original is 1 inch equals 200 feet.

Hand drawn survey map of part of the village of Mendon with a public access site on the St. Joseph river in the year 1970. The scale on the original is 1 inch equals 40 feet.

Printed map with a hand drawn line showing the proposed route of a straits of Mackinaw combination bridge and causeway for automobile traffic between the upper and lower peninsulas in Michigan. This proposal is known as the 'Island hopping plan' of 1931. This map shows Bois Blanc, Round, and Mackinac Islands in the Straits of Mackinac. The scale on the original is 2 inches equals 1 mile.

Printed color map of the City of Saginaw, Michigan in 1893. There is a street guide on the right side of the map. Scale on original is 1 inch equals 1000 feet.

Printed navigation chart for the Straits of Mackinac with an emphasis for the Lake Huron side. This chart shows water depth and navigation hazards as known for the year 1961. The scale on the original is 1 inch equals 1.25 miles.

Hand drawn maps on tissue paper of bridges in Waverly and Grant Townships of Cheboygan County, Michigan about the year 1945. The scale on the original is 1 inch equals 50 feet. These maps are examples of a series of bridge maps across the state of Michigan . Most of these maps are too fragile for scanning, but are available for research at the Archives of Michigan.

Hand drawn maps on tissue paper of bridges in Waverly and Grant Townships of Cheboygan County, Michigan about the year 1945. The scale on the original is 1 inch equals 50 feet. These maps are examples of a series of bridge maps across the state of Michigan . Most of these maps are too fragile for scanning, but are available for research at the Archives of Michigan.

Reproduction of a hand stenciled map of the proposed Straits State Park near St. Ignace, Michigan in the year 1959. The scale on the original is 1 inch equals 300 feet.

Printed tourist map of the Straits of Mackinac area in Michigan for about the year 1957 showing points of interest including the Mackinac Bridge. No scale given.

Hand drawn, waxed linen map of a proposed fishing site in Ada Township of Kent County, Michigan. By the year 1953 this map had a note saying that this public access site was to be converted into a site for a bridge. The scale on the original is 1 inch equals 100 feet.

Printed navigation chart for the Straits of Mackinac with an emphasis for the Lake Huron side. This chart shows water depth and navigation hazards as known for the year 1970. The scale on the original is 1 inch equals 1.25 miles.

Hand drawn map on tissue paper of a bridge in Frost Township of Clare County, Michigan about the year 1945. The scale on the original is 1 inch equals 50 feet. This map is one example of a series of bridge maps across the state of Michigan . Most of these maps are too fragile for scanning, but are available for research at the Archives of Michigan.

This blue print map shows a bridge in a Ford Motor Company Plant near Milan, Michigan in 1936.

Blue line copy of a hand stenciled map of a proposed approach to what would later become the Blue Water Bridge between Point Edward and Sarnia Ontario. Details of buildings of the village of Point Edward is shown as well as company lands on the outskirts of Sarnia. The scale on the original is 1 inch equals 100 feet.

This hand drawn plan shows cross sections of water wells, and a drawing of a bridge in Coldwater, Michigan. Celephane tape was placed on the fold lines in an attempt to repair the drawing.

Aerial view of the Mackinac Bridge over the Straits of Mackinac. Opened in 1957, the bridge connects the Upper and Lower Peninsulas of Michigan.