Cohasset, MA Coastal Insurance: Flood Risk Guide

The Geography: Nearly 69 Percent Water

Per Wikipedia's own figures for the town, Cohasset's total area is 31.4 square miles, and only 9.8 of those are land. The remaining 21.7 square miles, 68.9 percent of the town, is water, an even higher share than Scituate's already-unusual roughly 45 percent, and the highest confirmed in this cluster so far. That ratio is a direct reflection of Cohasset's exposed, deeply indented coastline: a rocky shore studded with offshore ledges, Cohasset Cove, an inlet locally called The Gulf, Straits Pond, Little Harbor, and Cohasset Harbor itself.

The town's own name is widely translated from a Massachusett-language word meaning roughly a long, rocky place, and the coastline earns it. Named offshore hazards, including a shallow reef called Grampus, West Shag and East Shag, and Minot's Ledge roughly three miles out, have a long, well-documented history of wrecking vessels, most famously the Irish immigrant brig St. John, driven onto the Grampus reef in an October 1849 storm with the loss of roughly 98 lives. During the Portland Gale of November 1898, Cohasset Harbor is separately documented as having seen a storm surge of roughly ten feet.

None of that history translates into a specific, present-day flood-zone map for any given Cohasset parcel. It does mean that a town built this far into the water, with this much rocky, exposed shoreline, is not a place to guess about flood risk casually. The next section covers exactly what could, and could not, be confirmed about how FEMA currently maps that risk here.

What This Page Cannot Tell You: FEMA Zones and CRS Class

Some neighboring South Shore towns in this cluster have specific, sourced flood-program detail attached to them. That is not the case here, and this page will not manufacture it. The research behind this page could not confirm Cohasset's specific FEMA Special Flood Hazard Area zone designations, whether particular neighborhoods carry an AE or a VE designation, nor could it confirm Cohasset's Community Rating System class, the FEMA program that ties a town's floodplain-management practices to a premium discount.

Do not assume Cohasset shares a neighboring town's confirmed CRS class, and do not assume Cohasset's coastal neighborhoods carry the same AE and VE zone framing documented for other towns in this cluster. Those are that town's own confirmed figures, not Cohasset's, and applying them here without verification would be a real mistake given how much a CRS class or a zone letter can move an actual premium.

This page also did not find a dedicated, named seawall or revetment project for Cohasset comparable in specificity to the funded, engineering-scoped projects documented for some neighboring shorelines. That does not mean no coastal protection exists in Cohasset; it means this research pass did not find one with that level of public, dollar-figure documentation. A direct attempt to fetch the town's own FEMA Flood Maps page was blocked by a rate limit during this research; anyone who needs Cohasset's actual zone and CRS detail should retry that page directly, or check FEMA's own Community Rating System community list, rather than rely on an assumption borrowed from a neighboring town.

Cohasset's Own Coastal-Resilience Investment: the FY24 State Grants

What is confirmed, and specific, is Cohasset's own state-funded coastal-resilience work. The town received two FY24 Massachusetts Coastal Zone Management Coastal Resilience Grants totaling $447,770: $220,000 for Priority Coastal Flood Resiliency Improvements for Wastewater Infrastructure, and $227,770 for James Brook Watershed Coastal Flood Pathways Mitigation Design. Both build on an earlier 2022 award of $161,925 for related vulnerability-assessment work, per the town's own Coastal Resilience FY24 page.

The vulnerable infrastructure and locations named in that same town source are specific: the Wastewater Treatment Plant and Influent Pump Station in Jacob's Meadow, plus flood-pathway vulnerabilities around Cohasset Cove, the James Brook watershed, Summer Street, and Cohasset Harbor itself. That is a real, if modest-dollar, acknowledgment from the town's own planning process of exactly where its flood pathways run.

Public engagement on this specific grant work ran through at least a final public forum on June 26, 2024, following a project kickoff meeting in February 2024, a harbor site walk in May 2024, and an open house in June 2024. The research behind this page did not confirm design or implementation status beyond that June 2024 forum. Anyone weighing a property near Jacob's Meadow, Cohasset Cove, James Brook, Summer Street, or the harbor should check the town's own website directly for whatever has happened with this work since.

A Genuine Contrast: Left Out of the 2026 Federal Funding Round

Worth stating plainly, because it is a real, sourced fact rather than an oversight in this research: Cohasset was not among the towns named in the most recent, June 2026 FEMA pre-disaster-mitigation flood-resilience funding round. That federal program made more than $189 million available nationally and over $17 million for New England, and named neighboring Scituate ($1.1 million for its Cedar Point seawall) and Hull ($1.1 million for Harborview Road shoreline protection) as eligible recipients, per FEMA's own press release and Boston Globe coverage from June 2026.

Cohasset does not appear in either source for that specific 2026 round. That is a genuinely different, and separate, funding picture from its immediate neighbors: Cohasset's own coastal-resilience dollars, the FY24 CZM grants described above, come from a state program, not this federal one, and total a smaller figure than either of the single named federal awards to Scituate or Hull. Do not assume Cohasset is quietly participating in the same 2026 federal round on the strength of its neighbors' awards; the two funding streams are distinct, and this one, as of this research, does not include Cohasset.

Regional 2026 Storms: What Happened Nearby, and What Is Not Confirmed for Cohasset

Two winter storm events are documented for this South Shore region in early 2026, and both plausibly affected Cohasset given its shared coastline with its neighbors, though this research could not confirm Cohasset-specific damage or outage figures for either one. A February 23, 2026 nor'easter is documented, in neighboring Scituate's own research, as having produced extensive coastal flooding and knocked out power to roughly 70 percent of that town, with whiteout conditions and blocked roads.

A separate, named January 30 through February 2, 2026 nor'easter, and broader South Shore blizzard coverage describing more than 245,000 Massachusetts residents losing power during that stretch, were also documented in this research. Neither source broke out a Cohasset-specific damage count, flooded street, or outage percentage.

The honest framing is that these were regional storms, and a town with Cohasset's exposed, rocky, 69-percent-water geography sitting on the same stretch of coast as Scituate almost certainly felt some version of both events. But that is a reasonable inference, not a confirmed figure, and this page will not invent a Cohasset-specific outage percentage or a named flooded street to make the story feel more complete than the sourcing actually supports. Anyone who experienced either storm directly in Cohasset, or who wants a documented account of local impact, should check the town's own emergency-management updates or local South Shore news coverage from those specific weeks.

Wind Versus Flood: Two Different Insurance Questions

Standard Massachusetts homeowners insurance does not cover flood damage, and that split matters in a town this exposed to the water. Wind damage, a tree limb through a roof, shingles peeled off in a nor'easter, is ordinarily a homeowners-policy question. Storm-driven water intrusion, the kind a ten-foot 1898 storm surge in Cohasset Harbor or a modern nor'easter's coastal flooding would produce, is a flood question, handled through the National Flood Insurance Program or a private flood policy, not a standard homeowners form.

This page has not confirmed, and will not invent, any Cohasset-specific windstorm or named-storm deductible structure, any insurer's name doing business in town, or any premium figure for either wind or flood coverage. Coastal Massachusetts carriers commonly layer their own separate wind or named-storm deductible provisions on top of a standard policy, and how a given carrier defines and triggers that deductible varies. Ask a current, Massachusetts-licensed agent exactly how a specific carrier structures both wind and flood coverage for the parcel you are considering, rather than assuming a figure that applied somewhere else on the South Shore applies here.

Before You Budget an Insurance Number

This page has not priced a policy for any Cohasset property. No FEMA flood-zone letter, no Community Rating System class or discount, no NFIP premium figure, no windstorm-deductible structure, and no insurer name were confirmed in the research behind it, and none are stated here as if they were. What is confirmed is a genuinely water-dominant, rocky, historically storm-exposed town with its own real, if modest, state-funded coastal-resilience investment, and a documented absence from the most recent round of federal flood-resilience funding that reached two of its immediate neighbors.

Two concrete next steps will actually answer the question this page cannot: look up the specific parcel's flood zone directly through FEMA's Map Service Center, and get a written quote from a Massachusetts-licensed insurance agent who can price that exact parcel under current flood maps and underwriting rules. Do not rely on a neighboring town's confirmed AE or VE zone framing, a neighboring town's confirmed CRS class, or a neighbor's premium as a stand-in for Cohasset's own figures; none of those have been confirmed to carry over. This page is independent research and general information, not insurance, legal, or financial advice; confirm every figure with a licensed Massachusetts insurance agent, and where relevant a financial advisor, before making a purchase decision.