Boston put a price on holding back the ocean, and it’s a big one. Mayor Michelle Wu and the U.S. Army Corps of Engineers released a draft Coastal Storm Risk Management study that pencils out at $9 to $10.5 billion, the city’s most concrete answer yet to rising seas and stronger storms.
What the plan actually builds
The draft would permanently close 20 long-term coastal flood pathways, the low inland routes where storm surge sneaks in. It spans 16 of Boston’s 47 coastline miles across five neighborhoods: East Boston, Charlestown, Dorchester, downtown and the North End, and South Boston. The Corps pegs the payoff at roughly $41 billion in avoided damages, and estimates $54 billion in losses by century’s end if the city does nothing. Every dollar spent, by its math, saves at least four.
The money question
A finished feasibility study, targeted for 2028, is what unlocks up to 65% federal cost sharing. That still leaves Boston and the state to find billions, and the plan doesn’t yet say who pays which share. Coastal defense has become a growth market for civil builders, from Gulf storm work tied to projects like the I-10 Mobile River Bridge and Bayway to seawalls and surge barriers up the Eastern Seaboard. Public comment on the draft plan runs from July 24 through September 18, the start of a years-long march from study to shovels.