Mackinac Bridge

Location

State: Michigan

County: Emmet County and Mackinac County

Feature Carried: I-75

Feature Crossed: Straits of Mackinac

Latitude, Longitude: 43.8368,-84.7248

Toll: On free road

Maintenance Responsibility: State Toll Authority

Structure Open, Posted, or Closed to Traffic: Posted for load (may include other restrictions such as temporary bridges which are load posted)

History

Year Built: 1957

Historical Significance: Bridge is on the National Register of Historic Places.

Year Reconstructed: None

Picture Date: August 31 and September 1, 2025

Geometry

Lanes on Structure: 4

Lanes under Structure: 0

Skew: 0 degrees

Number of Main Spans: 3

Main Structure Type: Suspension

Main Structure Material: Steel

Number of Approach Spans: 57

Approach Structure Type: Truss - Deck

Approach Structure Material: Steel continuous

Condition

Inspection Date: August 2023

Deck Condition: Good

Superstructure Condition: Good

Substructure Condition: Very Good

Channel Condition: Excellent

Culvert: Not Applicable

NBI Year: 2024

Coming Soon