Mackinac Bridge
Facts
- Overview
- Suspension bridge over the Straits of Mackinac on I-75 at Mackinaw City
- Status
- Open to traffic
- History
- Built 1957
- Design
- Wire suspension
- Dimensions
-
Length of largest span: 3,801.0 ft.
Total length: 19,248.6 ft.
Deck width: 47.9 ft.
- Recognition
- Posted to the National Register of Historic Places
- Approximate latitude, longitude
- +45.81917, -84.72750 (decimal degrees)
45°49'09" N, 84°43'39" W (degrees°minutes'seconds") - Inventory number
- BH 20027 (Bridgehunter.com ID)
- Inspection (as of 08/2004)
- Deck condition rating: Very Good (8 out of 9)
Superstructure condition rating: Excellent (9 out of 9)
Substructure condition rating: Good (7 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 56.0 (out of 100) - Average daily traffic (as of 2003)
- 12,398