Despite recognizing that restoring beaver populations is key to recovery of imperiled salmon and steelhead species, a federal agency just gave the go-ahead to keep killing beavers in Oregon.

In a long-awaited analysis, the National Marine Fisheries Service (NMFS) issued its findings on the impact on salmon and steelhead of continued killing of Oregon beavers by Wildlife Services, an arm of the U.S. Department of Agriculture.

The NMFS analysis highlighted the importance of beavers in creating excellent fish habitat and demonstrated that beavers have been reduced to only 3-10 percent of their historical populations.  Despite the clear connection between beavers and healthy salmon and steelhead populations, NMFS concludes that Wildlife Services’ beaver killing will not harm twelve species of salmon and steelhead that require protection under the Endangered Species Act because their populations are so imperiled.

“NMFS acknowledges in this opinion that Pacific Northwest salmon and steelhead evolved with beaver dams and adapted to their presence, yet, in the same document turns a blind eye to a federal agency killing 400 or more beavers a year in the Beaver State,” said Andrew Hawley, an attorney with the Western Environmental Law Center. “Allowing Wildlife Services to resume business as usual, NMFS missed the opportunity to set clear guidelines on when beaver killing shouldn’t and should be allowed given beavers’ importance to the threatened and endangered fish of Oregon.”

The NMFS analysis, called a biological opinion, does require some long-overdue minimum measures to better understand how many beavers are being killed, such as accurate monitoring and timely reporting. In the future, NMFS has instructed Wildlife Services to provide information on the benefits of beavers and their dams, and the availability of non-lethal control measures to anyone who asks the agency to kill a beaver within salmon or steelhead habitat.

In its opinion, NMFS also encourages Wildlife Services to promote the use of nonlethal methods to remove or discourage beavers. These non-lethal control measures such as flow control devices to maintain the level of beaver ponds, fencing to prevent beavers from building dams in culverts, and wrapping trees are widely available and effective tools to reduce conflicts and allow beavers to play their essential role in aquatic ecosystems.

“This opinion is a classic mix of science and politics in the Trump era,” said Nina Bell, executive director of Northwest Environmental Advocates. “The science overwhelmingly says that beavers are essential to preserving and creating salmon habitat, yet the federal agencies conclude that continued beaver killing should proceed so long as they send reports about it. Unfortunately, there is no link between more paperwork and salmon survival.”

The NMFS opinion was spurred by a 2017 threat by environmental groups to sue Wildlife Services over its failure to analyze the effects of its beaver killing on threatened and endangered salmon and steelhead. As required by the Endangered Species Act, program managers then agreed to consult with NMFS and to stop killing beavers, river otter, muskrat, and mink in Oregon pending this opinion.

Numerous studies show that beavers benefit endangered salmon and steelhead by creating ponds that provide fish with food and habitat. Despite these well-established ecological benefits, in past years, Wildlife Services killed hundreds of beavers annually with traps, snares and firearms. In 2016 the program in Oregon killed more than 400 beavers—the official state animal.

“Beavers are ecologically important, as well as hardworking and adorable, and the federal government should stop killing them,” said Collette Adkins, a Center for Biological Diversity attorney and biologist. “I’m glad that over the last several years, our efforts saved hundreds of Oregon’s beavers. We’re going to keep fighting for them.”

ESA-listed species NMFS says killing beavers is “likely to adversely affect” but “not likely to jeopardize the continued existence” of:

Columbia River chum salmon

Middle Columbia River steelhead

Lower Columbia River coho salmon

Lower Columbia River steelhead

Lower Columbia River Chinook salmon

Upper Willamette River Chinook salmon

Upper Willamette River steelhead

Snake River spring/summer-run Chinook salmon

Snake River fall-run Chinook salmon

Snake River Basin steelhead

Oregon Coast coho salmon

Southern Oregon/Northern California Coast coho salmon

ESA-listed species NMFS and Wildlife Services say killing beavers “may affect but are not likely to adversely affect” the following species or their critical habitats:

Upper Columbia River spring-run Chinook

Upper Columbia River steelhead

Snake River sockeye salmon

Southern distinct population segment Pacific eulachon

Southern distinct population segment green sturgeon


Andrew Hawley, Western Environmental Law Center, 206-487-7250,

Collette Adkins, Center for Biological Diversity, 651-955-3821,

Nina Bell, Northwest Environmental Advocates, 503-295-0490,

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