By Emily Dwight and Kirt Mayland
Photographs by Josh Duplechian
A Once in a Lifetime Opportunity
After decades of failure in trying to make fish passage work at multiple dams, there could finally be a real solution for saving wild Atlantic salmon in America. While they once returned in the hundreds of thousands to every major coastal river north of the Housatonic River in Connecticut, wild Atlantic salmon in the United States have declined to the point where the remaining populations in Maine are listed as endangered and protected under the Endangered Species Act.[1] On September 15, 2025, The Nature Conservancy signed a historic $168 million purchase agreement for the four dams on the lower Kennebec River,[2] which represents more than just an ambitious restoration project for wild Atlantic salmon.
The planned purchase and removal is also a recognition that some problems cannot be engineered around, and now there is the potential for a once-in-a-generation opportunity to correct 100-year-old mistakes. The pattern on the Kennebec has been depressingly familiar. Good people with good intentions have tried again and again to thread an impossible needle: keeping four dams operating while somehow shepherding endangered salmon and other fish past them to their spawning grounds. The results speak for themselves. After nearly three decades under a 1998 settlement agreement that promised “rapid restoration” of fish runs, [3] there has been neither rapid progress nor meaningful restoration.[4]
The Nature Conservancy’s agreement with Brookfield could change the equation entirely. For the first time, people are not trying to jerry-rig a solution around the problem—they’re addressing it directly. And the timing couldn’t be more critical. Returning populations of wild Atlantic salmon in the northeastern United States have plummeted to less than 1% of their historic levels, with the only remaining wild populations restricted to a few rivers in Maine, and still threatened by existing dams.[5] The numerous attempts at multi-dam fish passage have never worked for the anadromous fish – ultimately causing repeated stress and resulting in high mortalities.
The Math Never Added Up
Let’s start with what should have been obvious all along: these four dams—Lockwood, Hydro-Kennebec, Shawmut, and Weston—have a combined generation capacity of approximately 43 megawatts.[6] Collectively hat represents less than half of one percent of Maine’s total electricity generation, and just six percent of its hydroelectric capacity.[7]

To put this in perspective: Maine has added nearly 2,000 megawatts of solar capacity in recent years and is projected to add another 75- megawatts over the next five years.[8] The entire output of these four dams could be replaced by roughly 250 megawatts of solar paired with battery storage—a technology that is becoming increasingly more cost-effective due to federal tax credits which cover 30-50% of construction costs[9]and which were untouched by the One Big Beautiful Bill.[10]
Meanwhile, these dams rate at the bottom of the energy density scale, inflicting disproportionate environmental damage compared to their meager power contribution, adversely affecting up to 800 miles of river and stream habitat. They sit towards the bottom of the river, in the worst possible location, blocking access to the Sandy River watershed, which contains ideal Atlantic salmon spawning and rearing habitat. The dams are the biological equivalent of a stuck turnstile every few miles on the only road to town.
If hydropower were truly essential in this location (it’s not), another single, properly designed dam with modern and efficient turbines located higher up the river could potentially generate as much power without obliterating salmon populations. For instance, the Harris Station (aka Indian Pond) Dam, the uppermost hydroelectric dam on the Kennebec, has a capacity of approximately 85 MW,[11] nearly double the capacity of these four dams combined, and if it were upgraded with more powerful turbines, it could potentially produce more. The decision to build these four dams over a century ago reflected the narrow focus on power generation at the time. The impacts of dams on biological communities in riverine and riparian ecosystems played little role in the decision to construct dams in the early 1900s.[12] These four dams were also constructed long before major federal environmental legislation was passed in the early 1970s, which would have required review of their ecological impacts. The biological needs of migratory fish were overlooked at the time to further the objective of water storage and power generation.[13]
Learning from Failure—And From Success
The failure rates of fish passage for Atlantic salmon, American shad, river herring, and other species on other northeast rivers such as the Susquehanna, Connecticut, and Merrimack tell a sobering story. Multi-dam fish passage systems have utterly failed to restore populations on these rivers despite decades of effort and millions in investment. According to a 2012 study, less than 3 percent of American shad made it past the dams in these rivers to their spawning reaches.[14] On the Susquehanna, passage efficiency through four dams has often been near zero, with only 8 out of over 10,000 shad making it past the fourth dam in 2014.[15] Similarly, on the Kennebec, the Lockwood fish lift passed just 5 American shad in 2022—out of thousands attempting the journey.[16]
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With an Atlantic salmon run down to 54, the restoration program on the Connecticut and its 5 dams with passage facilities was shut down in 2012, and the program on the Merrimack was abandoned as a failure in 2013.[17]
Salmon can experience weeks of delay at dams with fish passage trying to pass upstream, preventing them from spawning multiple times — a critical factor for population recovery.[18] Downstream migration for their juveniles is often similarly unsuccessful. If the dams were to remain, even with the passage and performance standards proposed in the federal relicensing filings, the Kennebec Coalition estimated that more than 10 percent of juvenile salmon (smolts) would die swimming downstream. The Coalition further estimated that the same four projects would prevent roughly 15 percent of the returning adults from returning to their spawning habitat. Even if everything worked perfectly – “if all the wildly optimistic performance standards were met” – there would still be a combined ‘take’ of more than one fifth of each generation of Kennebec River Atlantic salmon, before accounting for natural mortality.[19]

The best available science tells us why: dams don’t just block fish—they fundamentally impact biodiversity and alter river ecosystems. They create warm man-made lakes that alter the natural flow of the rivers, favoring “pond” species over native, fluvial species, and invite predation by river birds and land mammals. Destruction cannot be mitigated, only removed. For that reason, from California to New Jersey, 27 states removed 108 dams in 2024[20] as they considered the dams antiquated solutions to both adding new hydroelectric energy generation facilities and restoring fish populations.
Many of these efforts have been successful. Recent results on Oregon’s and California’s Klamath River show what is possible when restoration is chosen over half-measures. Within weeks of removing the final dam in October 2024, over 6,000 Chinook salmon returned to newly accessible habitat—areas they hadn’t reached in over a century.[21]

The news gets even better. In October 2025, monitoring crews confirmed that fall Chinook salmon have made it all the way into the Williamson and Sprague rivers above Upper Klamath Lake— traveling nearly 300 miles upstream for the first time in over 115 years. Scientists have already documented dramatic improvements in water quality, with river temperatures self-moderating, and toxic algae blooms that acted as “heat batteries” in the rivers and reservoirs either shrinking or nearly disappearing. Damon Goodman, Mount Shasta-Klamath regional director for California Trout commented “[t]he rivers seem to come alive almost instantly after dam removal, and fish returned in greater numbers than I expected and maybe anyone expected.”[22]
For the Klamath Tribes, whose members hadn’t witnessed salmon in their ancestral waters for generations, the return has been deeply moving. Tribal Chair William Ray Jr. described their return as “mixed feelings for many tribal members, both rejoicing and a blessing. But also, a certain amount of remorse—all those elders and all those generations that didn’t get to see this happen.” [23]
Closer to home, the Penobscot River’s dam removals sparked an immediate explosion in river herring populations,[24] creating new recreational fishing opportunities and demonstrating that dam removal can coexist with continued hydropower production upstream.
The Kennebec has been called “the Klamath of the East” for good reason. This is a river where removal of aging dams could potentially unlock tremendous ecological and economic potential—and he Klamath’s stunning success shows this isn’t wishful thinking, it is proven science.
What This Deal Makes Possible

The Nature Conservancy’s agreement could change everything. For the first time, there is a realistic path to restoring over 800 miles of pristine spawning habitat, most of it in the Sandy River watershed,[25] arguably the best Atlantic salmon habitat on the East Coast.
The Sandy River represents nearly half of all salmon habitat in the Merrymeeting Bay watershed, and it produces the highest percentage of wild, naturally-reared Atlantic salmon in the country.[26] But this isn’t just about salmon. The environmental and economic benefits would cascade throughout the region by restoring commercial fisheries, enhancing recreation, restoring ecosystems, and increasing property values.
Restored Commercial Fisheries
Aside from the benefits to Atlantic salmon, other fish such as American shad, river herring, and American eels could potentially return to historical abundance. Maine’s juvenile eel fishery, already worth nearly $20 million annually, despite limited upstream access, is second in value to only the lobster industry.[27] With dam removal, it could expand dramatically. American shad once numbered in the millions in these waters; their return would support valuable fisheries throughout their range.
Ecosystem Restoration

As a result of removing dams on the Penobscot River, approximately 3 million river herring returned.[28] River herring provide crucial nutrients and forage for healthy watersheds and coastal fisheries—their restoration could help rebuild groundfish populations like cod and halibut that Maine’s fishing communities depend on.[29] The return of marine-derived nutrients from ocean-going fish benefits the entire watershed, from aquatic insects to the birds and wildlife that feed on them.[30] A free-flowing Kennebec could also provide resiliency against the effects of climate change, allowing nature and species that rely on the river to adjust and even thrive unimpeded by engineered obstructions or fixes.
Enhanced Recreation and Increased Property Values
A free-flowing river from the Sandy River to the Gulf of Maine could transform roughly 30 miles of slow, warm water stalled behind the dams and lead to better conditions for recreational kayaking, canoeing, and fishing. After 1999, when Edwards Dam near Augusta was removed, recreational fishing opportunities appeared immediately[31] and continue to thrive today. The Kennebec could become a destination for anglers, paddlers, and wildlife enthusiasts from across the country, generating substantial tourism revenue for riverside communities.
Further, studies show that free-flowing rivers can increase nearby property values. Flowing rivers with active rapids can be more attractive to live by than the stagnant lakes created by and next to hydropower dams. The removal of the Edwards Dam demonstrated this reality, showing a positive effect on riparian property values after dam removal.[32]
Balancing Communities, Energy and Conservation

The Sappi Somerset Mill in Skowhegan, ME, employs 780 people and recently completed a $500 million upgrade. Local municipalities worry about lost tax revenue which may total up to $500,000 annually with the dams’ removal.[33] These are legitimate concerns that deserve serious attention and serious solutions, not dismissal.
The Nature Conservancy has committed to finding solutions that protect both the mill and the river. The newly formed Kennebec River Restoration Trust will work with Sappi and local communities over the next five to ten years to develop plans that meet everyone’s needs.[34] This measured approach provides time for careful planning and community engagement—not the rushed decisions that some fear.
This approach mirrors the successful Penobscot River restoration, where the removal of the Great Works Dam fully funded necessary adjustments to industrial and municipal infrastructure. No mill jobs were lost, no mills closed, and the river dramatically recovered.[35] The same model could work on the Kennebec.
As for energy concerns, the numbers simply do not support claims about a loss in grid reliability. At less than 1% of Maine’s total electricity generation, these dams are nearly irrelevant to the state’s energy security. ISO New England has consistently demonstrated that the grid can absorb the retirement of much larger generation sources. With Maine’s massive solar buildout underway adding capacity equivalent to these four dams combined, coupled with robust regional transmission, the loss of 43 megawatts shouldn’t even register on the grid reliability radar.
Importantly, Brookfield remains committed to operating its dams higher up the Kennebec watershed[36] continuing to produce clean hydropower for Maine while allowing the lower river to be restored. This isn’t a choice between renewable energy and river restoration, it’s a rebalancing that achieves both objectives.
Why This Time Is Different
The timing could not be more urgent. Atlantic salmon in the Gulf of Maine are at the brink of extinction, with returning fish hovering near historic lows.[37] The Merrymeeting Bay region is the only salmon recovery area where wild populations are increasing — almost entirely because of the Kennebec.[38] However, that growth cannot continue with these four dams in place. The Kennebec, along with the Penobscot, offer some of the last, best hopes for recovery of wild Atlantic salmon populations in the United States.[39] What makes this agreement fundamentally different from past attempts is its honesty. The agreement recognizes that continued hydropower operation and effective fish restoration on these four dams are incompatible goals. The previous path, which has been the norm for nearly 30 years—was heading toward yet another expensive compromise[40] resulting in multimillion dollar fish passage facilities that science tells us won’t work, condemning another generation to watch salmon disappear while pretending the problem is being solved.

Dam owners and agencies have tried the engineering approach, built fish lifts and studied bypass reaches, held countless meetings and produced thousands of pages of documents. Decades and millions of dollars were spent and wasted. And after all that effort, the results were a failure, just as similar efforts failed on the Connecticut, the Merrimack, and the Susquehanna.
The Nature Conservancy’s approach embraces what decades of failure have taught us. Rather than demanding immediate action, it provides time for careful planning and community engagement. Rather than forcing a choice between jobs and fish, it seeks solutions that strengthen both the economy and ecology. Rather than another Band-Aid on a broken system, it can offer genuine healing.
This is about correcting mistakes our predecessors made 100 years ago based on the knowledge, technology, and priorities of their time. They should not be blamed for building these dams when the nation needed electricity and did not fully understand river ecology. But we know better today. We know these four dams are poorly placed. We know their energy contribution is negligible and easily replaced. We know they’re destroying irreplaceable wild salmon populations and decimating other valuable fisheries. And we also know that threats from climate change make protecting resilient natural systems more important than ever.
Maine’s Moment to Lead
Like the Klamath, this is a river where removal of aging dams could unlock tremendous ecological potential. Like the Klamath, this is about righting historic wrongs and restoring connections between rivers and the sea. Like the Klamath, this requires courage to choose restoration over the status quo.
The Nature Conservancy’s purchase agreement offers something Maine hasn’t had before: a realistic path forward that acknowledges the limits of technology and embraces the power of restoration. It provides the funding, the timeline, and the commitment to do this right—to work with communities, protect jobs, and restore the river.
Standing on the banks of the Kennebec today, one can imagine two futures. In one, dam owners and agencies continue trying to engineer around problems created 100 years ago, watching salmon populations dwindle while debating the minutiae of fish passage designs that will probably never work. In the other scenario, the state embraces restoration creating a world-class river that drives economic growth, supports thriving fisheries, honors Indigenous connections to these waters, and becomes a source of pride for everyone.
[1] NOAA Fisheries, “Atlantic Salmon (Protected): In the Spotlight. Last updated June 20, 2025. ”https://www.fisheries.noaa.gov/species/atlantic-salmon-protected/spotlight
[2] The Nature Conservancy. “The Nature Conservancy and Brookfield Reach Deal for Four Lower Kennebec River Dams.” Newsroom. Published September 23, 2025. Accessed March 12, 2026. https://www.nature.org/en-us/newsroom/kennebec-river-restoration/.
[3] Friends of Merrymeeting Bay. “Lower Kennebec River Comprehensive Hydropower Settlement Accord and Related Findings (PDF).” Filed May 28, 1998. https://cybrary.fomb.org/pages/19880526_Lower%20Kennebec%20River%20Comprehensive%20Hydropower%20Settlement%20Accord.pdf.
[4] Maine Department of Marine Resources. “Sea-Run Fisheries: Trap Count Statistics.” https://www.maine.gov/dmr/sites/maine.gov.dmr/files/docs/trapcounts2021.pdf.
[5] NOAA Fisheries, “Atlantic Salmon (Protected): In the Spotlight.
[6] Sharma, Shaleish and Waldman, John. City University of New York. “2012 Study on Fish Passage (CUNY Academic Works).” https://academicworks.cuny.edu/qc_pubs/574/.
[7] Maine Department of Marine Resources. “Final Amendment (page 30).” December 2020. https://www.maine.gov/dmr/sites/maine.gov.dmr/files/docs/Final%20Amendment_12_22.pdf#page=30.
[8] Solar Energy Industries Association. “Maine State Solar Policy.” Updated March 2026. https://www.seia.org/state-solar-policy/maine-solar.
[9] Latham & Watkins. “One Big Beautiful Bill: New Law Disrupts Clean Energy Investment.” July 8, 2025. https://www.lw.com/en/insights/one-big-beautiful-bill-new-law-disrupts-clean-energy-investment.
[10] U.S. Congress. “H.R. 1 — 119th Congress: Bill Text.” Enacted July 4, 2025. https://www.congress.gov/bill/119th-congress/house-bill/1/text.
[11] The Dead River. “The Legacy of Harris Station Dam: Opening the Gates at the Head of the Gorge.” https://thedeadriver.com/the-legacy-of-harris-station-dam/#:~:text=Initial%20nameplate%20(1954%E2%80%931955)%3A,Black%2DStart%2C%20Plain%20%26%20Simple.
[12] Dorning, Sarah. Journal of Science Policy & Governance, Volume 12, Issue 1. “Dorning (2018) Article (PDF).” February 2018. https://www.sciencepolicyjournal.org/uploads/5/4/3/4/5434385/dorning_2018_jspg.pdf.
[13] Liermann, Catherine, et. al. BioScience, Volume 62, no. 6. “Implications of Dam Obstruction for Global Freshwater Fish Diversity.” June 2012. https://www.noaa.gov/sites/default/files/legacy/document/2020/Oct/07354626533.pdf.
[14] Waldman, John. Yale Environment 360. “Blocked Migration: Fish Ladders on U.S. Dams Are Not Effective.” April 4, 2013. https://e360.yale.edu/features/blocked_migration_fish_ladders_on_us_dams_are_not_effective.
[15] Waldman, John, et. al. The New York Times. “Let the Susquehanna River Run Wild.” September 7, 2014. https://www.nytimes.com/2014/09/08/opinion/let-the-susquehanna-river-run-wild.html.
[16] McCormick, Sean. CentralMaine.com. “The Kennebec River belongs to all Mainers, not just Brookfield.” October 25, 2022. https://www.centralmaine.com/2022/10/25/maine-compass-the-kennebec-river-belongs-to-all-mainers-not-just-brookfield/.
[17] Purnell, Ross. Fly Fisherman. “Raising Athletes: We Have to Do Something Different for Atlantic Salmon.” May 5, 2015. https://www.flyfisherman.com/editorial/atlantic-salmon-hatchery/152070.
[18] Rubenstein, Sarah. University of Maine. “Energetic Impacts of Passage Delays in Migrating Adult Atlantic Salmon.” August 20, 2021. https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=4511&context=etd.
[19] Kennebec Coalition’s and Conservation Law Foundation’s Joint Comments in Response to Notice of Availability of the Draft Environmental Impact Statement for the Shawmut Hydroelectric project, Lockwood Hydroelectric Project, Hydro-Kennebec Hydroelectric Project, and Weston Hydroelectric Project: Project nos. 2322-069, 2322-071, 2325-100, 2574-092, and 2611-091.
[20] American Rivers. “Big Year for Dam Removals in 2024.” March 4, 2025. https://www.americanrivers.org/2025/03/big-year-for-dam-removals-in-2024/.
[21] Gunderson, Jeff. ASCE Civil Engineering Source. “Benefits Flow Quickly as Historic Dam Removal Restores Klamath River.” February 13, 2025. https://www.asce.org/publications-and-news/civil-engineering-source/article/2025/02/13/benefits-flow-as-historic-dam-removal-restores-klamath-river.
[22] Burns, Jes, et. al. OPB. “Salmon Clear Last Klamath Dams, Reaching Williamson and Sprague Rivers.” October 17, 2025. https://www.opb.org/article/2025/10/17/salmon-clear-klamath-dams/.
[23] Burns, Jes. OPB. “Klamath River Temperatures Changed Dramatically After Dam Removal. That’s Helping Salmon Swim Farther Upstream.” October 28, 2025. https://www.opb.org/article/2025/10/28/klamath-river-temperatures-dam-removal-salmon-upstream/.
[24] Giegar, Olivia. U.S. Fish & Wildlife Service. “An Open Penobscot.” May 3, 2023. https://www.fws.gov/story/2023-05/open-penobscot.
[25] The Nature Conservancy. “Restoring Balance to the Kennebec River.” https://www.nature.org/en-us/about-us/where-we-work/united-states/maine/kennebec/.
[26] NOAA. “Biological Valuation of Atlantic Salmon Habitat in the Gulf of Maine DPS (ESA).” 2009. https://cybrary.fomb.org/ESA/20090000_NOOA_Bio_val_Atlantic_salmon_habitat_GOM_Distinct_Population_Segment.pdf.
[27] Christle, Michele. Down East Magazine. “The Upstream Battle to Preserve Maine’s Lucrative Elver Fishery.” October 2024. https://downeast.com/land-wildlife/the-upstream-battle-to-preserve-maines-lucrative-elver-fishery/.
[28] Geiger, Olivia. “U.S. Fish & Wildlife Service. “Who gives a dam about river herring?
Removing dams has returned 3 million migratory fish to the Penobscot River; here’s why that matters.” May 3, 2023. https://www.fws.gov/story/2023-05/open-penobscot.
[29] Maine Department of Marine Resources. “River Herring (Alewife) Fact Sheet.” Accessed March 14, 2026. https://www.maine.gov/dmr/fisheries/sea-run-fisheries/programs-and-projects/river-herring-alewife-fact-sheet.
[30] U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service; U.S. Department of the Interior, Fish and Wildlife Service. Recovery Plan for the Gulf of Maine Distinct Population Segment of Atlantic Salmon (Salmo salar). Final Plan for the 2009 ESA Listing. https://www.fisheries.noaa.gov/s3/dam-migration/final_recovery_plan2.pdf.
[31] Natural Resources Council of Maine. “Edwards Dam and Kennebec River Restoration.” https://www.nrcm.org/programs/waters/kennebec-restoration/.
[32] Lewis, Lynne Y., Curtis Bohlen, and Sarah Wilson. “Dams, Dam Removal, and River Restoration: A Hedonic Property Value Analysis.” Contemporary Economic Policy Volume 26, no. 2 (2008): 175–186. https://damremoval.eu/wp-content/uploads/2024/09/Lewis-et-al.-2008-Dams-dam-removal-and-river-restoration-A-hedonic-property-value-analysis.pdf.
[33] Gartner, Emmett. “Historic Sale of Dams Clears the Way for Salmon to Return to the Kennebec River.” The Maine Monitor. Published September 23, 2025. https://themainemonitor.org/dams-sale-salmon-return-kennebec-river/.
[34] The Nature Conservancy. The Nature Conservancy and Brookfield Reach Deal
[35] Bennett, Nick. Testimony in Opposition to LD 1979, An Act To Sustain Good‑paying Jobs in the Forest Products Industry by Ensuring Consistency between Comprehensive River Resource Management Plans and State Water Quality Standards. Testimony before the Maine Legislature’s Environment and Natural Resources Committee. Natural Resources Council of Maine. February 28, 2022.
https://legislature.maine.gov/testimony/resources/ENR20220228Bennett132904920283725357.pdf.
[36] The Nature Conservancy. The Nature Conservancy and Brookfield Reach Deal
[37] Atlantic Salmon Commission (U.S.). “Annual Report of the U.S. Atlantic Salmon Assessment Committee.” Report No. 35, 2022 Activities. 2023. https://doi.org/10.25923/skxm-wk46.
[38] NOAA Fisheries. “Collaborative Management Strategy for the Gulf of Maine Distinct Population Segment of Atlantic Salmon: 2023 Report of 2022 Activities.” https://www.fisheries.noaa.gov/s3/2023-08/2023CMSAnnualReporton2022activities-GARFO.pdf.
[39] Lohan, Tara. “Our Last, Best Chance to Save Atlantic Salmon.” The Revelator. Published April 5, 2021. https://therevelator.org/kennebec-atlantic-salmon/.
[40] Federal Energy Regulatory Commission. “Final Environmental Impact Statement for Amendment of Licenses to Incorporate an Interim Species Protection Plan for the Shawmut Project et al., under P‑2322 et al.” February 28, 2025.
https://elibrary.ferc.gov/eLibrary/filelist?accession_number=20250228-3002.
- Ferguson, Laura. Tufts Now. “The Gulf of Maine Is Warming Faster Than Pretty Much Anywhere Else.” Tufts University, July 31, 2025. https://now.tufts.edu/2025/07/31/gulf-maine-warming-faster-pretty-much-anywhere-else








