Ducks Unlimited Joins $60 Million Herring River Restoration Project

WELLFLEET, MA — Work is underway to restore the Herring River estuary on Cape Cod, but a well-known outdoors company has recently stepped up to help financially.

Ducks Unlimited is partnering with the National Park Service, U.S. Fish and Wildlife Service, National Oceanic and Atmospheric Administration Restoration Center, Massachusetts Division of Ecological Restoration, Wellfleet Conservation Trust, Friends of Herring River, the town of Wellfleet and others on a $60 million project to replace a dike built in 1909 with a bridge, and implement vegetative and sediment management to reestablish natural salt marsh conditions.

The bridge will be equipped with control gates to return the natural flow of tidewater to the marsh, a news release said. It is scheduled to be finished in 2025, and the gates will "be incrementally opened to reintroduce tidal flow to 890 acres and will continue to be monitored to allow for adaptive management."

“The Herring River Estuary is the largest tidally restricted estuary in the northeast and this project is a once-in-a-century opportunity to address the impacts of past generations,” said DU Regional Biologist Bri Benvenuti.

“The scale and success of the Herring River Restoration Partnership is an excellent example of what can be achieved when conservation and community partners come together.”

In November, park staff, in partnership with AmeriCorps Cape Cod members and park volunteers, will begin on the groundwork to clear freshwater vegetation that has "encroached into the former tidal floodplain around the Herring River in Wellfleet," officials said, in a news release.

"Partnering with AmeriCorps Cape Cod and volunteers from the Friends of Cape Cod National Seashore, the first small steps toward the eventual restoration of hundreds of acres of coastal wetlands will begin as crews clear thick and overgrown vines, shrubs, and small trees from about six acres along the Herring River in the area around High Toss Road in Wellfleet," the release said.

In addition to making way for a restored salt marsh, clearing vegetation in the area will provide access for scientists to collect data to develop and evaluate methods for restoring the floodplain.

The area has seen increased freshwater vegetation since 1909 when saltwater flow in the river was blocked by installing the Chequessett Neck Road Dike. Before the dike was built, most of the Herring River supported a highly productive salt marsh, dominated by cordgrass and other native salt-tolerant species, officials said.

The lack of tidal exchange and saltwater input into the estuary led to the conversion of salt marsh to freshwater wetlands. All these freshwater wetland species will eventually die-back as the native salt marsh is revived by restored tidal flow, thanks to the project.

More extensive vegetation clearing begins this winter, as the park begins the process of removing dead trees and promoting the recovery of native salt marsh vegetation in the Duck Harbor area of the Herring River.

Since January 2021, the 120-acre Duck Harbor floodplain has had periodic over wash of saltwater breaking over the dunes on Cape Cod Bay, mostly during spring tide periods.

Removing the dead vegetation should bring back more salt marsh plants and increase the ecological productivity of Duck Harbor. It will also help minimize a breeding habitat for mosquitoes.

Tree and shrub removal will be accomplished with heavy-duty mulching equipment and will be accompanied by intensive scientific monitoring to document ecological changes, officials said.