Two road crossings carry everything onto Cape Cod. The Sagamore Bridge is one of them, it opened in 1935, and it has no shoulders, substandard lane widths and an owner that isn’t a highway agency. MassDOT is replacing it with twin spans, built in phases so traffic never stops.
Project Scope
The package covers the twin replacement spans plus reconstruction of the interchanges at both approaches. The existing steel arch carries US Route 6 and a bike path. Funding is unusually well assembled for a project this size: roughly $1.72 billion is already dedicated, including $993 million from the FHWA Bridge Investment Program and a $372 million Mega Grant, alongside about $350 million from the Army Corps and $750 million from the Commonwealth. The Sagamore span alone runs about $2.1 billion against a $4.5 billion total for the Cape Cod Bridges Program.
Procurement opened in March 2026 with letters of interest, moving through an RFQ and RFP to a notice to proceed expected in late 2027. Construction starts winter 2027-2028, the first span opens to traffic in 2033 and the second in 2037.
Why It Matters
The Army Corps owns the bridge and MassDOT is delivering the replacement, a split that has slowed this project for two decades and required a funding structure drawing on both. The companion Bourne Bridge replacement on Route 28 is fully designed and not yet funded, which is why the programme total and the Sagamore figure diverge. Phased construction with no full closure is the binding constraint on means and methods here: on a peninsula where summer traffic is the regional economy, taking the crossing down was never on the table.
Project Team & Details
| Developer | Massachusetts Department of Transportation |
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| Owner / Client | U.S. Army Corps of Engineers |
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| Status | Planned |
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| Delivery Method | Design-Build |
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| Funding Source | Mixed |
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