MPO staff warn full closures likely if Cape Cod Canal bridges aren’t replaced; twin-arch design favored

Stephen Tupper, Cape Cod Commission staff serving the MPO, told members the Canal Bridges program is the region’s most consequential transportation undertaking and that recent reports from the Army Corps and MassDOT make urgent the case for replacement. He said the Army Corps’ decision documents and other program reports are posted at capecodcommission.org/canal and noted staff are bringing on a consultant to quantify regional economic impacts if closures occur.

Tupper highlighted program scope and the draft preferred structural concept — a twin‑arch bridge that would retain two through travel lanes, add entrance/exit ramp lanes, provide a fully separated shared-use path for pedestrians and cyclists, and include shoulders to facilitate future maintenance. He said both the Bourne and Sagamore bridges show typical deterioration for structures approaching 90 years of age, but emphasized they are monitored and considered safe by the Army Corps in their current condition.

On operational impacts, staff cited daily usage numbers — including roughly 122 bus trips crossing the bridges each day — and stressed that even short closures would ripple across school transportation and regional services. Tupper said the Army Corps has indicated that a major rehabilitation could require full bridge closure for four to six months plus temporary lane closures totaling 12 to 16 months.

On funding and schedule, Tupper said the Commonwealth has prioritized Sagamore Bridge funding and that the Haley administration announced roughly $372,000,000 in federal grants toward the program; staff are awaiting results of a bridge-infrastructure application for more than $1 billion. He said Cape Cod Commission staff will support the federal grant case by commissioning an economic-impact analysis to show consequences to the regional economy if closures occur, and will continue to coordinate Section 106 (historic‑preservation) technical meetings.

Members and public commenters asked about the project area and public engagement schedule. Member Kevin Galligan highlighted the need to plan for utility relocations (he noted natural-gas lines hung under the bridges), and John York asked why quarterly public-information and stakeholder advisory meetings did not match the schedule in the public-involvement plan. Tupper replied that the slide shown described the broader study area (different from the narrower project area graphics) and that staff would follow up with the project team on meeting schedules and publicly advertised sessions.

Next steps: staff said they will share notices of upcoming public meetings and return to the MPO with further updates as federal funding decisions and program analyses progress.