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Mackinac Bridge Information and Photos Michigan Interactive
  The Mackinac Bridge connects the upper and lower peninsulas of Michigan over the five mile wide Straits of Mackinac and runs from Mackinaw City to St Ignace. The Mackinac Bridge's towers are 552 feet above the water and it has a center span of 3,800 feet. Designed by David B. Steinman it was completed in 1957.
Mackinac Bridge Stats:
Total length of Bridge with approaches (5 miles) - 26,372 ft.
Total length of steel superstructure - 19,243 ft.
Length: Suspension bridge (including anchorages) - 8,614 ft.
Length: Main span (between main towers) - 3,800 ft.
Main towers above water - 552 ft.
Maximum depth of water at mid span - 295 ft.
Maximum depth of tower piers below water - 210 ft.
Height of roadway above water at mid span - 199 ft.
Under clearance at mid span for ships - 155 ft.
Total length of wire in main cables - 42,000 miles
Number of wires in each cable - 12,580
Weight of cables - 1,840 tons
Diameter of main cables - 24 1/2 inches
Diameter of each wire - 0.196 inches
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