Mackinac Bridge

Mackinac Bridge is located in Michigan, USA. It crosses the Mackinac Straits between Lake Michigan and Lake Huron, connecting St. Ignace and Mackinaw City.

The length of the bridge is 5 mi (8 km ), and the section across Mackinac Straits is 4.1 mi (6.6 km) long. It was built in 1939 and opened to traffic in 1957. It cost US $100 million in 1940.

Mackinac Bridge
Mackinac Bridge



  • 1923: The state of Michigan launched a car ferry service between Mackinaw City and St. Ignace, indicating that there is a huge traffic demand here.
  • 1884: A local newspaper published an imaginary article “The Proposed Bridge Across the Strait of Mackinac”.


  • 1923: The State Assembly ordered the State Highway Administration to establish ferry services on both sides of the strait. Every year, more and more people use ferries to cross the strait, and as in the past, the movement to build bridges is increasing.
  • 1928: Ferry services have become expensive, and Michigan Governor Fred W. Green ordered a study of the feasibility of building a bridge across the strait.
  • 1934: The Michigan State Legislature established the Mackinac Strait Bridge Authority to explore possible ways to build and fund the proposed bridge.
  • 1936 to 1940: The administration chose a route for the bridge based on preliminary research. The drilling is to conduct a detailed geological study of the route.
  • April 30, 1952: The national legislature approved the sale of US$85 million in bonds for bridge construction.
  • January 1953: David B. Steinman was appointed as a design engineer.
Mackinac Bridge visitors
Mackinac Bridge visitors

Construction process

  • May 7, 1954: Construction of Mackinac Bridge began.
  • November 1, 1957: The bridge was opened to traffic, and the ferry service was suspended that day.
  • June 25, 1958: Mackinac Bridge was officially put into use.
  • November 1, 2007: Mackinac Bridge Authority held a celebration to celebrate the 50th anniversary of the bridge’s opening.
Beautiful sceneryMackinac Bridge
Beautiful sceneryMackinac Bridge

Building technical parameters

The Mackinac Bridge is 5 mi (8 km) long, and the section across Mackinac Straits is 4.1 mi (6.6 km) long.

The height of the bridge tower is 551 ft (168 m) and the height of the bridge deck is 200 ft (61 m). The bridge deck is 69 ft (20.9 m) wide and the 4-lane is 52 ft (16 m) wide. The longest span reaches 3799 ft (1158 m). It was a veritable super project at that time.

Mackinac Bridge Night view
Mackinac Bridge Night view

Mackinac Bridge Data

North America
In use
Other name
Mighty Mac or Big Mac
St. Ignace and Mackinaw City, Michigan, USA
David B. Steinman
Official website
Mackinac Bridge Authority
US $100 million in 1940
May-07, 1954
Nov-01, 1957
Total length
5 mi ( 8 km )
Tall (tower)
551 ft ( 168 m )
Length over water
4.1 mi ( 6.6 km )
69 ft ( 20.9 m )
Longest span
3799 ft ( 1158 m )
Deck elevation
200 ft ( 61 m )
Design type
Suspension bridge
Road scale
4 lanes
Straits of Mackinac

Mackinac Bridge Location On Earth

Filter by
View Mackinac Bridge on Google Satellite Map

Google satellite maps allow you to see building details more clearly, including natural landscapes such as mountains, rivers, deserts, sea and man-made engineering buildings.

If you are very interested in this engineering building, it is a good idea to click below Google Map icon. We will help you jump to the corresponding location of this building or engineering on Google satellite map.

Go to Google Satellite Map
Scale ( only within the industry of this building / engineering )
Technology ( only within the industry of this building / engineering )
Cost ( only within the industry of this building / engineering )
Era-1954 ( The earlier the era, the higher the score,respect the older generation of engineering )


Please enter your comment!
Please enter your name here