Drive down Beaver Dam Road in Manomet and it looks like failure. Flat sandy fields, old dikes, a scatter of drainage ditches gone quiet. Most people who pass it assume they're looking at a cranberry farm that gave up. That assumption is wrong on the timeline. What's actually happening on that land, and on several other parcels scattered around Plymouth, is one of the largest and longest-running land projects the town has ever taken on, and it's still adding acreage.
The short version: Plymouth and its conservation partners have spent close to two decades converting retired cranberry bogs into public wetlands and trails, one property at a time, and the pace picked up again within the last year. If you haven't walked Beaver Dam Road since before the pandemic, the map has changed more than you'd expect.
What Was Actually Growing Here
The 481 acres now known as Tidmarsh Wildlife Sanctuary were cranberry bogs starting in the 1890s. At its peak, the operation, known as Tidmarsh Farms, contributed about 1 percent of Ocean Spray's entire annual harvest. That's a real farm, not a hobby plot. As the Massachusetts cranberry industry contracted in the early 2000s, owners Glorianna Davenport, an MIT professor and filmmaker, and Evan Schulman decided against selling to a developer. Instead they began what became a 15-year restoration effort, working with the state's Division of Ecological Restoration, the USDA's Natural Resources Conservation Service, and eventually Mass Audubon, which now owns and manages the sanctuary.
The engineering involved was not cosmetic. Nine dams came out. Roughly three miles of new stream channel were dug to replace the straightened, sand-choked ditches that a century of cranberry cultivation had left behind. Beaver Dam Brook, which the farm's dikes had blocked from the ocean, was reconnected to Plymouth Harbor for the first time in more than a hundred years. NOAA Fisheries, one of the federal partners on the project, has called it the largest freshwater ecological restoration completed in the Northeast to date.
The Town Didn't Stop at One Property
Here's the part that doesn't show up in the tourist version of this story. Tidmarsh wasn't a one-off. It was the first domino, and the town has kept knocking down more.
Directly across Beaver Dam Road sits Foothills Preserve, also called Tidmarsh West, a 100-acre former bog now owned outright by the Town of Plymouth and undergoing its own restoration in partnership with Ducks Unlimited. A few miles away, the town's Kapell-Pinnacle Cranberry Bog Restoration Project added another 50.23 acres, about 15 of them former bog, taken out of agricultural production through the federal Wetlands Reserve Program. In West Plymouth village, the town separately acquired more than 51 acres of wetlands, uplands, and cranberry bog, with public parking now sited on Rocky Pond Road, and that parcel is slated for wetland restoration through 2026.
Then, at the Fall 2025 Annual Town Meeting, voters approved the purchase of 20.8 more acres, including two additional cranberry bogs located off Beaver Dam Road and Bog Side Drive. The reasoning wasn't just conservation for its own sake. The property has frontage on Little Island Pond, and state officials flagged it because the artificial water drawdown from active bog operations there was affecting irrigation discharge into the adjacent Tidmarsh sanctuary. In other words, the town bought the neighboring bog partly to protect the restoration it had already spent 15 years building next door.
None of this happened on a shoestring. Plymouth's Division of Natural Resources reports it has secured more than $95 million in combined grant and appropriation funding for this category of work, covering dam removals, river and bog restorations, land acquisitions, and trail construction. That figure puts the individual projects in scale. This isn't one nonprofit protecting one pretty parcel. It's a town-run program with real budget behind it, and the 2025 purchase shows it's still active, not winding down.
Even Jenney Pond, closer to downtown, got attention in this same push. The town dredged nearly 2,500 cubic yards of accumulated sediment from the pond over the winter of 2024 and 2025 to restore flood storage and aquatic habitat, and replaced a 1960s-era pedestrian footbridge with an ADA-accessible one connecting the sidewalks at Jenney Park to Newfield Street. It's a smaller project than Tidmarsh, but it's the same office, the same funding mechanism, and the same underlying pattern: old agricultural and industrial water infrastructure across Plymouth is quietly being rebuilt into public land almost every year.
What You Can Actually Walk Right Now
If the history is interesting, the current trail network is the reason to put on boots. The entrance and parking lot sit at 60 Beaver Dam Road, at the start of the trail network.
| Trail | Length | What you'll see |
|---|---|---|
| All Persons Trail | 0.3 mile | Universally accessible, crosses the meadow to an overlook platform above restored marsh |
| Volunteer Trail | About 1 mile each way | Cattail marsh on one side, newly restored wetland on the other; migrating ducks in fall |
| Overlook Trail | 0.2 mile | Short climb to a valley view where Beaver Dam Brook now runs through former bog |
| Loop Trail | 0.6 mile loop, plus a 0.1 mile spur | Closest approach to the active restoration zone, where cattails have replaced the old cranberry monoculture |
A few practical notes worth knowing before you go. Dogs and horses are not permitted at Tidmarsh itself, service animals excepted, which surprises people used to more permissive conservation land elsewhere in town. Ticks are a real concern from spring through fall, so plan accordingly. And if you want to see the restoration doing its actual job rather than just admiring the view, fall is when Mass Audubon runs its herring count, tracking the fish that have returned to spawn in Beaver Dam Brook now that the dams are gone. It's volunteer-run and open to the public, and it's one of the more direct ways to see whether fifteen years of engineering actually worked.
The Map Keeps Changing
The easy version of this story treats Tidmarsh as a finished postcard, a nice place to walk when the leaves turn. The more accurate version is that Plymouth's Division of Natural Resources has been running an ongoing acquisition and restoration program for the better part of two decades, it has real money behind it, and it added acreage again as recently as the Fall 2025 Town Meeting. The bogs across Little Island Pond that residents drove past for years without a second thought are now on their way to becoming trail land too, in large part because the town needed to protect the water flowing into a sanctuary it already built.
That's the thing worth knowing if you live near any of this land, whether that's Beaver Dam Road, Bog Side Drive, Rocky Pond Road, or the stretch near Jenney Park. The quiet you're noticing on a fall walk isn't static. It's the visible result of an active, funded, multi-site program that keeps expanding, and next year's trail map is likely to look a little different from this year's.
For those of us who've spent years walking this town's back roads and shorelines, watching a former cranberry bog turn back into a working stream is one of the more satisfying things Plymouth has done with its open space. If you're curious how a particular neighborhood, from Manomet to West Plymouth to the areas nearer downtown, fits into the broader picture of how this town is changing and investing in itself, Jennifer Churchill is always glad to talk it through. Let's Connect.
