Beach Erosion in Marshfield, Massachusetts: A Rare Moraine, a Finished Project, and an Unfunded Debate

The Rexhame-Humarock Moraine: One of Only Two on the East Coast

Most East Coast barrier beaches are simple sand features -- long, low, and built entirely from wave-sorted sediment. The Rexhame-Humarock barrier-beach system is not. It includes an 84-foot-high moraine, a ridge of glacially deposited material left behind when the last ice sheet retreated, incorporated directly into the barrier-beach structure itself. That combination -- glacial moraine plus barrier beach -- is rare enough that it is described as occurring in only one other place on the entire U.S. East Coast. For a stretch of coastline this far south of New England's more obviously glacial terrain (think Cape Cod's outer bluffs), that is a genuinely distinctive fact, not a generic "New England beaches have glacial history" line.

Rexhame Beach itself is in Marshfield, and it is the town's own piece of this system. Humarock, the barrier-beach village the moraine also runs beneath, belongs to the neighboring Town of Scituate, not Marshfield -- the two are physically connected by the same barrier landform but administratively separate, a boundary quirk this page mentions only briefly since Humarock's fuller story (including the 1898 storm that physically cut it off from the rest of Scituate) belongs on Scituate's own pages, not Marshfield's.

The 2025 Beach Nourishment Project: Real Sand, Already Placed

Unlike a lot of coastal-resilience talk, this one is finished. Marshfield and Duxbury jointly received a combined $3.2 million Massachusetts Coastal Zone Management (CZM) Coastal Resiliency grant, with Marshfield's own share set at $1 million -- enough to fund 55% of the planned nourishment volume. The jointly permitted, two-town project totals 480,640 cubic yards of sand across 5,150 linear feet of shoreline; Marshfield's specific portion of that was 30,400 cubic yards across 720 linear feet, built as a 40-foot-wide berm on a 1V:15H slope fronting eleven Marshfield properties at Rexhame Public Beach, Winslow Avenue Town Beach, and Bay Avenue in Green Harbor.

Permitting ran from 2020 to 2023 -- a multi-year process before a single truckload of sand moved -- and construction actually happened between February 10 and March 14, 2025, with a final presentation to the Select Board on June 16, 2025. The contractor was SumCo, with the Woods Hole Group serving as environmental consultant. This is the clean, finished half of Marshfield's current erosion story: a dated, funded, completed nourishment project with real cubic-yardage figures behind it, not a proposal still working through Town Meeting.

Sunrise Beach: A Real Debate, Not a Funded Project

Roughly two months after that project wrapped up, a different erosion conversation reached the Select Board -- and this one remains unresolved. On July 28, 2025, resident Peter Howard presented an argument that Sunrise Beach's decades of erosion trace back to the 1970s, when a company called Marshfield Sand and Gravel removed rock and cobble from the beach, reportedly for crushing and use at the Pilgrim Nuclear Power Plant. Howard's case is that this removal stripped away the natural wave-energy absorption the cobble and rock once provided: "We used to have sandbars, tide pools, baby flounder... now it's just flat."

Howard proposed boulder and cobble replenishment as a fix, citing a $600,000 Salisbury Beach nourishment project as a rough cost comparison point. DPW Superintendent Sean Patterson and Town Planner Greg Guimond responded with two real obstacles: state and federal permitting hurdles, and the memory of a past nourishment effort at Sunrise Beach that was blocked entirely when oceanfront property owners would not sign the easements required to proceed. As of this reporting, no town funding has been allocated to Sunrise Beach -- this is a live, current, resident-driven advocacy effort, not a scheduled construction project, and anyone weighing property near Sunrise Beach should treat it that way rather than assuming a fix is already in motion.

Ocean Bluff's Revetment: Related, Covered in Full Elsewhere

Ocean Bluff belongs in an erosion discussion because a failing 1930s revetment there is a direct erosion-control failure -- shifted boulders, water seeping in behind the barrier, and sinkholes forming as sand erodes out from underneath. But the fuller story here is really a managed-retreat debate (repair the revetment at a cost estimated as high as $30 million, or fund a voluntary buyout letting homeowners relocate over 30 years at an estimated $7.6 million) rather than a straightforward erosion-mitigation question, so this page will not re-run that whole debate. It is covered in full, with the competing resident quotes and the Town Administrator's response, on this site's storm-prep-costs and hurricane-risk pages for Marshfield.

Watching the Coast in Real Time: The ARII Buoy Network

Separately from any single project or debate, Marshfield is also now part of a forward-looking coastal-science effort. The Atlantic Resiliency Innovation Institute (ARII), working with Northeastern University, is deploying a six-site environmental-monitoring buoy network across coastal Massachusetts, with Marshfield and Plymouth operational as of this writing. Those buoys collect real-time wave, wind, water-temperature, dissolved-oxygen, and turbidity data -- exactly the kind of baseline information that eventually informs erosion and nourishment decisions, even though ARII itself is a research and workforce-training initiative rather than a beach-repair program. It is an emerging effort, not decades-old infrastructure, and worth watching rather than treating as a settled resource.

What This Means If You're Evaluating Property Near Marshfield's Beaches

Marshfield's erosion picture is genuinely two-sided right now: a completed, funded nourishment project protecting Rexhame, Winslow Avenue, and Bay Avenue in Green Harbor, and a real but unfunded advocacy push at Sunrise Beach that may or may not go anywhere. This page does not state a specific erosion rate in feet per year for any Marshfield beach -- that figure was not confirmed in the research behind this page, and it should not be assumed or estimated. Anyone evaluating a property near Rexhame, Sunrise Beach, Green Harbor, or Ocean Bluff should ask the Town of Marshfield's DPW and Planning offices directly about the current status of any nourishment, cobble-replenishment, or revetment work fronting that specific parcel, and should treat a licensed coastal engineer and FEMA's Flood Map Service Center, not this page, as the source for a property-specific erosion or flood-risk determination.