Cape Cod Bridges Program

Cape Cod Canal Bridges Program

The Cape Cod Bridges Program, overseen by the Massachusetts Department of Transportation (MassDOT) will include the replacement of the Bourne and Sagamore bridges, improvements to the approach roadway network, multimodal improvements, utility relocations, and potential improvements independent of bridge replacements.

The project is currently in Phase 3: MassDOT has identified preferred options. The environmental documentation process and design development are both underway.

The Critical Connection to Cape Cod 

Built in 1935, the Bourne and Sagamore bridges span the Cape Cod Canal and connect residents, businesses, and visitors on the Cape and Islands to the mainland. The bridges are essential for general transportation, freight, and tourism, and in an emergency are critical routes for evacuation. The bridges are the only connection to and from Cape Cod for vehicular traffic.

The nearly 90-year-old bridges are both considered “functionally obsolete” while the Bourne Bridge is rated in poor condition and the Sagamore Bridge is rated in fair condition by the U.S. Army Corps of Engineers, which owns and maintains both bridges. The Army Corps 2020 Cape Cod Canal Bridges Major Rehabilitation Report (MRER) concludes that replacement of the bridges is the most reliable, fiscally responsible solution.

What’s included in the new bridge design?

The preferred design includes two bridges at each crossing because they are more cost-effective, structurally efficient structures. This approach allows for staged construction while keeping two lanes of traffic operational in both directions and allowing all existing roadway connections to be maintained.

The proposed new lanes will meet current highway standards and include two travel lanes in each direction with an additional entrance/exit lane to help maintain the flow of traffic. The new bridge design also includes for a shared use path and shoulders that will allow for emergency vehicle access.

MassDOT created several flythrough video renderings, including the replacement Sagamore Bridge and the recommended interchange south of the bridge. Additional videos are linked below.

Sagamore north alternative | Bourne south alternative | Bourne north alternative

How will the bridges be constructed?

The main spans will be constructed off site, floated in on the canal, and then lifted into place. Construction will be phased to prioritize shifting traffic onto a new structure as soon as possible while minimizing construction impacts.

Funding and Next Steps

One of the greatest challenges regarding the canal bridges replacement is funding. The state has committed $700 million dollars to support this project and are actively pursuing a number of federal grants to cover the bulk of project costs. The state’s latest round of federal grant applications phases the funding requests identifying the Sagamore Bridge replacement as Phase 1 while maintaining a commitment to replace both bridges.

In total, $1.72 Billion in federal funding has been secured for the project including funding through the discretionary National Infrastructure Project Assistance [Mega] Program and Bridge Investment Program announced in the 2024. Additional federal grant submissions have been made for replacement of the Bourne Bridge.

Total Estimated Program Costs: $4.5 Billion for replacement of both bridges including design, permitting, property acquisitions, construction, and contingencies for inflation.

Next Steps: Project design, permitting, and community outreach will continue for the replacement of both bridges. The study team submitted initial environmental permit applications in early 2023, and more detailed analysis and federal permitting documents are under development.