What Changed at Marshfield's Veterans Memorial Park After the Dam Came Out

"Bob saw seven fish!"

A North and South Rivers Watershed Association staffer shouted that in the middle of a staff meeting in May 2026, after weeks of volunteers looking down from the Main Street bridge at Veterans Memorial Park and seeing nothing. A few days later the same writer went back and found hundreds of herring, "plainly visible from the bridge, and nearly impossible to count." That happened at the corner of Routes 3A and 139, an intersection most of Marshfield drives through every week.

From the car window, the park looks about the way it always has. That was the plan. The engineering was meant to keep the parts people already knew while changing what the river could do under them. The waterwheel still turns, the lagoon still holds water, and the gazebo still looks over the South River. Beneath all that, the park has gone from a barrier on the river to the doorway into it.

Rebuilt to Look Like Itself

The obsolete industrial dam at the park came out in January 2025. NSRWA staff stood on the Main Street bridge in the cold and watched heavy equipment break the dam apart and haul it away. Planning started in 2012. Marshfield, its Veterans Commission, the MassBays program and the state's Division of Ecological Restoration worked with NSRWA on it. Much of the design work went to making sure "the park's beloved water wheel and heart-shaped lagoon would be restored to full function."

To get there, the crew dug a temporary bypass channel so fish could keep moving during migration season. They held the river back with coffer dams, took out the dam, and built a series of engineered riffles and pools in its place. The riffles let fish climb upstream and keep the lagoon at its water level. The lagoon walls were repaired and rebuilt as well. The coffer dams came out in July 2025. NSRWA wrote that the South River then "flowed freely for the first time in nearly 400 years."

That 400-year figure comes from the site's history. Around 1656, William Ford and Josiah Winslow built Marshfield's first grist mill here. In 1810 or 1814, the Duxbury & South River Manufacturing Company opened the town's first major factory on the same spot, making cotton and woolen goods. A sawmill followed in the 1850s. After 1900 came a boxboard mill, an ice house and a paint shop. In the 1930s a laundry known locally as "the wet wash" ran here. The mill building was torn down in the 1940s, and the town created Veterans Memorial Park in 1948 to honor military servicemen and women. The park was built on top of the dam, so for most of its life it sat on the barrier that blocked the river.

Seven Hundred Below, Four Above

Before the removal, a pool-and-weir fish ladder was all that let fish past the dam. Every spring, NSRWA's citizen scientists counted how well it worked. In spring 2023 they recorded about 700 river herring below the ladder and only 4 in the pool above it.

Compare that with the two spring runs since the dam came out. NSRWA reported in July 2026 that thousands of river herring had made it above the old dam site and on up to the next barrier at Chandlers Pond. Staff found herring in every section of the restored channel in 2026, and farther upstream too. The fish showed up fast. In May 2025, with construction still going, NSRWA's watershed ecologist, Alex Mansfield, filmed hundreds of herring half a mile above the park. They had come through the temporary bypass channel. NSRWA also photographed a bald eagle at the park, watching the river for herring.

The town's November 2024 press release listed the funding as a $1 million grant from the "National Fish and Wildlife Association," $261,000 from NSRWA, and $650,000 from the Town of Marshfield. NSRWA's own account credits the $1 million to the National Fish and Wildlife Foundation. That puts the town's share at about a third of the total.

A Wheel Built by Neighbors

The waterwheel is the part of the park drivers on 3A actually see, and it is new. The wooden wheel weighs 975 pounds and is 8 feet across. It went in on May 30, 2026, turns slowly in view of the intersection, and has a light on it at night. It was built at no cost to the town. Marshfield resident Greg Wheeler led the project. The Patriot Ledger reported that 15 volunteers worked on it with him, and the town's Department of Veterans' Services held the official dedication at the park on Thursday, Aug. 6.

The Ledger's photos from delivery day name Gabe Taylor, Charlotte Keith, Laurie Wheeler, Dan Biagini, Greg Wheeler, John Bryerton, Caleb Taylor, Anne McDonald, Andy Taylor and John Graves. They also show a sign at the park listing the volunteers and vendors who helped. NSRWA's event notice called the Aug. 6 ceremony a celebration "of the dam removal and restoration of the South River at this site." In practice the dedication tied the two projects together. The wheel honors the veterans the park was built for, and it turns in a river that now runs all the way through.

Seven-Tenths of a Mile

The park's place on the river explains why this matters beyond the park itself. The South River is about 15 miles long and starts at Round Pond in Duxbury. It is a tidal estuary up to Veterans Memorial Park, which sits 8.8 miles from Massachusetts Bay. The next barrier upstream is Chandlers Pond Dam, 9.5 miles from the ocean. That leaves about seven-tenths of a mile of river between the park and the last dam on the main stem.

The two sites go back a long way together. The Duxbury & South River Manufacturing Company that built the factory at the park also ran a mill at Chandler's Pond. NSRWA describes Chandlers Pond Dam as being on private property and in poor shape. It has vegetation growing on the crest, crumbling stonework, and signs that water has gone over the top in the past. For the last decade, NSRWA has worked with the state and the landowners on a design that would restore fish passage without making flooding worse downstream. No construction date has been announced.

Farther up, the river is already open. The Temple Street Dam in Duxbury came down in August 2026, after 14 years of planning, in less than 15 minutes. That was the river's uppermost barrier. Removing it reconnects another 4 miles of stream plus 3 miles of tributaries and restores 6.5 acres of open-water wetland. Herring running up from the sea now reach the restored channel at Veterans Memorial Park and stop at Chandlers Pond. Above that pond, miles of reconnected river are waiting. Chandlers Pond Dam is now the last thing standing between the two.

What's at the Park This Fall

NSRWA's August 2026 update said work on ADA accessibility and on the park features that honor veterans will likely continue through the end of 2026. Expect some unfinished pieces if you go now.

• Getting there. NSRWA's park listing points to an unpaved pull-off on Plain Street, Route 139, next to the park. From there a path runs down a gentle slope into the park, and a short trail on the other side of the parking area leads to a gazebo that looks over the river. The listing was written before the reopening, so the details may have changed.
• Walking on. The park is part of the South River Greenway, a string of green spaces in Marshfield's downtown that includes South River Park, Pratt Farm, the Keville Footbridge, Dandelion Park and the Rail Trail/Bridle Trail.
• The art still to come. Local artists Sally Dean and Cathy McCarthy made six mural-wrapped poles showing the South River's native fish, birds and plants, paid for by a Massachusetts Environmental Trust grant. The unveiling was postponed at the Aug. 6 event, and no new date has been posted.
• The story in a gallery. NSRWA's "Beneath the Surface" exhibit runs Oct. 11 through Nov. 13 at the Art Complex Museum in Duxbury and deals with dams and the health of South Shore waterways. A panel with NSRWA scientists and artists is set for Thursday, Nov. 12, 5:30 to 7 p.m., at the museum.
• Veterans Day. The town's parade and ceremony are on Nov. 11. The parade steps off at 10:30 a.m. from Library Plaza and heads to the Town Training Green on Moraine Street.

The herring are gone by now and won't be back until spring. NSRWA's citizen scientists will keep watching the run and working with the Massachusetts Division of Marine Fisheries to make sure enough water flows for fish passage. The Main Street bridge, where those first seven fish were seen, is where the next count will start.

At Escalate Real Estate, we follow changes like the one at Routes 3A and 139 because they shape what Marshfield center feels like day to day, and because they come up when neighbors start thinking about a move. If you own a home near the South River Greenway and want to know how the neighborhood is changing around it, Audra Stevens can walk you through it and put together a free home valuation whenever you're ready.