Atlantic Salmon Conservation Efforts

Introduction to Atlantic Salmon Recovery

Maine has removed a 60-year-old river barrier on the Narraguagus River, replacing it with a nature-like fishway designed to reopen migration routes for endangered fish. The old ice-control dam in Cherryfield, built by the US Army Corps of Engineers in 1961, long blocked salmon, shad, and river herring from reaching upstream spawning grounds.

The Narraguagus River runs about 40 miles from its source in the downeast lakes to its head-of-tide in Cherryfield. Along much of its length, the river and its tributaries are wild and largely undeveloped, with shaded stretches and rocky bottoms that biologists describe as prime Atlantic salmon habitat.

The Problem of Declining Atlantic Salmon Populations

Yet for decades, the salmon have been missing. In recent years, only around 25 wild adult salmon have returned to the Narraguagus annually to spawn, a tiny fraction of the hundreds of thousands that once migrated through Maine’s rivers each spring.

Gulf of Maine Atlantic salmon are listed as endangered under the federal Endangered Species Act. Across the state, only about 1,000 adults come back from the sea each year. To move the population from endangered to threatened, Maine would need at least 1,500 wild adults returning each year for multiple years.

Conservation Efforts for Atlantic Salmon

A coalition of conservation groups, including the Maine Coast Heritage Trust, the Downeast Salmon Federation, the Atlantic Salmon Federation, and The Nature Conservancy, proposed replacing the dam with a nature-like fishway that would maintain ice and flood control while allowing fish to move more freely.

The project received $9.1 million from NOAA’s Restoration Center as part of the Bipartisan Infrastructure Law, and construction started in June 2026. The new design uses a series of stair-stepping pools that mimic a natural stream channel.

• The new fishway is intended to slow ice and reduce flood risk without creating the sharp drop and turbulence that blocked fish at the old dam.
• Alongside the river work, the project is also revamping a nearby park that was rarely used, adding bathrooms, an amphitheater, electricity, and a floating dock requested by local children.

Measuring Success in Atlantic Salmon Recovery

Scientists plan to measure the impact of the new fishway using shad as a proxy for salmon and other sea-run fish. Shad are more numerous than salmon in the Narraguagus but are also more sensitive to barriers, so their movement can signal how well the passage is working.

Researchers are collecting water samples above and below the dam site and sending them to the University of Maine in Orono to test for shad DNA. Baseline samples taken in spring 2026, before the dam was removed, showed more shad DNA below the Cherryfield dam than above it.

Challenges Ahead for Atlantic Salmon

Even with the barrier gone, the future of Atlantic salmon in the Narraguagus is uncertain. Maine sits at the southern edge of the species’ range, and the Narraguagus runs warm compared with more northern rivers.

Atlantic salmon begin to experience stress when water temperatures rise above 68 degrees Fahrenheit, a threshold the river often exceeds in summer. As summers grow longer and hotter, that thermal stress is expected to increase.

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Conclusion and Future of Atlantic Salmon Recovery

The removal of the Cherryfield dam and construction of the nature-like fishway will not solve every problem facing Gulf of Maine salmon. Ocean conditions, warming waters, and shifts in marine food webs remain major unknowns.

But by reconnecting the river and improving habitat, conservationists are buying time and creating the conditions where a comeback becomes possible, even if it unfolds over decades. The official federal recovery plan, updated in 2019, estimates that restoring the Gulf of Maine population could take 75 years and cost more than $800 million, while also improving overall watershed biodiversity.

Expert Perspectives on Atlantic Salmon Recovery

According to experts, the recovery of Atlantic salmon in Maine is a complex issue that requires a multi-faceted approach. 'The removal of the Cherryfield dam is a crucial step in the recovery of Atlantic salmon, but it is only one part of a larger effort to restore the species,' said a spokesperson for the Maine Coast Heritage Trust.

Implications for Readers in India

The story of Atlantic salmon recovery in Maine has implications for readers in India, where similar conservation efforts are underway. The removal of dams and restoration of natural habitats can have a significant impact on endangered species, and the use of innovative techniques such as nature-like fishways can help to mitigate the effects of climate change.

What to Watch Next in Atlantic Salmon Recovery

As the recovery efforts for Atlantic salmon continue, there are several key developments to watch. The construction of the new fishway is expected to be completed by November 2026, and scientists will be monitoring the impact of the project on the salmon population. Additionally, the use of shad as a proxy for salmon and other sea-run fish will provide valuable insights into the effectiveness of the new fishway.