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Mackinac Bridge Museum ~ Facts & History
Interesting Mackinaw Bridge Facts
Information from the original 1957 brochure, updated.
Lengths
- Total Length of Bridge with Approaches: 26,444 ft. (5 miles)
- Total Length of Steel Superstructure: 19,243 ft.
- Length-Suspencion Bridge (Including Anchorages): 8,614 ft.
- Total Length-North Approach Spans: 7,129 ft.
- Length-Main Span (Between Main Towers): 3,800 ft.
Heights & Depths
- Height of Main Towers above Water: 552 ft.
- Maximum Depth to Rock at Midspan: Unknown
- Maximum Depth to Water at Midspan: 295 ft.
- Maximum Depth of Tower Piers below Water: 210 ft.
- Height of Roadway above Water at Midspan: 199 ft.
- Underclearance at Midspan for Ships: 155 ft.
- Maximum Depth of Water at Piers: 142 ft.
- Maximum Depth of Piers Sunk through Overburden: 105 ft.
Cables
- Total Length of Wire in Main Cables: 42,000 miles
- Maximum Tension in Each Cable: 16,000 Tons
- Number of Wires in each Cable: 12,580
- Weight of Cables: 11,840 Tons
- Diameter of Main Cables: 24.5 inches
- Diameter of Each Wire: 0.196 inches
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