Boston has been sponsoring an Army Corps feasibility study since 2022 without knowing what it would produce. Now it does. The first draft, released in the last week of July, puts more than 20 infrastructure projects along 16 miles of coastline on the table and opens a path to federal money covering 65% of the cost.
The city’s coastal resilience program runs close to $10 billion. Under the 1986 Water Resources Development Act, that cost share is the mechanism. The Corps estimates the resulting floodwalls, berms and floodgates would prevent about $41 billion in damages.
Why Boston’s flood exposure is structural
One-sixth of Boston sits on filled tidelands. Land that used to be harbor is now downtown. Since 1991 the city has been through 24 federal or state disaster declarations, 14 of them involving major flooding.
Brian Swett, Boston’s chief climate officer, doesn’t undersell the study: it “is the big kahuna.” He described the moment the scale became clear: “We recognized the significance of what we were facing — billions of dollars in infrastructure costs and massive amounts of our population at risk, with 40% of Boston residents living in areas that are projected to flood in the latter half of this century.”
Boston is the only major U.S. city that zones new construction to a forward-looking flood standard, currently 40 inches of sea level rise by 2070. That’s a design requirement developers and their engineers have been building to for years while the public infrastructure behind it stayed unfunded.
The 35% nobody has figured out yet
Federal cost share means local cost share. Mayor Michelle Wu’s FY2027-2031 capital plan allocates $75 million to a Coastal Resilience Reserve, which funds the match and interim flood-pathway fixes. The rest is unsolved.
“This is a math problem for us to solve over the next 15 years,” said Nayeli Rodriguez, deputy director of Boston’s Office of Climate Resilience. Options on the table include resilience improvement districts, cruise ship landing fees and hotel taxes.
The business community is pushing. Lindsey Butler, executive director of the Green Ribbon Commission, called the partnership “a once-in-a-generation opportunity to unlock significant federal funding to protect Boston’s major job centers and our state’s economic competitiveness.” Her colleague Rebecca Herst was more direct about the constituency: “Our members represent some of the largest institutions and employers in Boston, and they are telling us clearly that reducing risk from flooding is an urgent priority.”
The final report lands in 2028. Contractors in the Northeast civil market should read the draft now — 16 miles of shoreline hardening is a decade of work, and the bid pipeline in New England is already tightening.