Where the Bridge Replacement Programme Actually Stands

Every car that has ever arrived on Cape Cod crossed either the Bourne or the Sagamore bridge. Both opened in 1935, both were built and are maintained by the US Army Corps of Engineers, and each carries four narrow lanes with no shoulders across the Cape Cod Canal.

The Sagamore is 1,408 feet long with a 616-foot main span and 135 feet of clearance above the water, and it takes US-6, which is the road nearly everyone wants. The Bourne carries Route 28 to the Upper Cape and Falmouth. There is no third crossing, which is why an incident on one of them backs up an entire peninsula.

Both are slated for replacement. The shape of the programme is settled: new spans are to be built alongside the existing bridges so that traffic keeps moving throughout construction, the old bridges come down afterwards, and ownership of the new crossings passes from the federal government to Massachusetts.

The timetable is the part that has moved. Funding has been assembled in stages from federal bridge programmes and state sources rather than in a single award, and the projected start has shifted more than once, with construction discussed as beginning in the late 2020s and the full programme running for something in the region of eight to ten years. Published completion estimates have changed as the funding picture changed.

For a visitor planning a trip in the next few seasons, the practical position is unchanged. The existing bridges remain in service. Periodic maintenance lane closures continue and are announced in advance, and a single-lane closure on a summer Friday is genuinely significant, because there is no capacity anywhere else in the system to absorb it.

Two habits are worth keeping regardless of what the programme does. Check for scheduled bridge work before a summer weekend drive. And avoid crossing between two and eight on a Friday afternoon southbound, or between three and seven on a Sunday afternoon northbound, which is when the queue forms with or without roadworks.

This is moving ground. Verify the current programme status with the Massachusetts Department of Transportation before you rely on any date.