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Bridges and Structures

M-231 Road and Bridge Project.
Department of Transportation

Bridges and Structures

The Blue Water Bridge with the sun rising.

Structure Design

Structure Design provides statewide design support for MDOT trunkline structure projects. Structure Design delivers plans, specifications, and estimates for structures including bridges, culverts, and other ancillary structures.

Structure Design
M-231 bridge located on the north side of the Grand River.

Structure Construction

Provides statewide construction support to department projects with structural elements including, bridges, retaining walls, and sign and lighting support structures.

Structure Construction
The Charlevoix Lift Bridge opening.

Structure Preservation and Management

The Office of Structure Preservation and Management is responsible for the administration of the overall bridge capital outlay program, NBI Program, and Preservation Section.

Structure Preservation and Management
A crane and workers placing segments of a soundwall.

Geotechnical Services

Geotechnical Services Section supports the planning, design, construction, and maintenance of geotechnical features essential for MDOT’s bridge and heavy civil infrastructure.

Geotechnical Services
Michigan Bridge Conditions map screenshot showing locations of bridges with different reported conditions.
Michigan Bridge Conditions map screenshot showing locations of bridges with different reported conditions.

Michigan Bridge Conditions

Bridge condition ratings are an important tool for transportation asset management.

Launch the Michigan Bridge Conditions web map

Blue Water Bridge

The Blue Water Bridge spans the St. Clair River between Port Huron, Michigan, and Point Edward and Sarnia, Ontario, and forming gateway linking Canada and the United States.

Gordie Howe International Bridge

The Gordie Howe International Bridge spans the Detroit River and connects Detroit, Michigan, with Windsor, Ontario.

International Bridge

The Sault Ste. Marie International Bridge connects Sault Ste. Marie, Ontario, with Sault Ste. Marie, Michigan, and is the only vehicular crossing between Ontario and Michigan within a 300-mile distance.

Mackinac Bridge

The Mackinac Bridge is a suspension bridge spanning the Straits of Mackinac, connecting Michigan's upper and lower peninsulas.