Endangered coho salmon returned to California's Mendocino Coast rivers in record numbers this year, with 30,000 fish completing their spawning migration—double last year's record and ten times the population from a decade ago—in a rare conservation success story that demonstrates how habitat restoration can reverse species decline.
The remarkable recovery, announced by NOAA Fisheries, reflects more than 100 habitat restoration projects completed over the past fifteen years across the Ten Mile River, Pudding Creek, and Gualala River watersheds. The collaborative effort brought together federal agencies, conservation organizations, timber companies, and local landowners to rebuild the spawning and rearing habitat that coho require to complete their complex life cycle.
Removing barriers, reconnecting rivers
The Central California Coast coho salmon population—listed as endangered since 2005—had dwindled to fewer than 3,000 fish by 2015, victims of decades of logging, agriculture, and development that degraded stream channels, blocked migration routes, and eliminated the cool, complex habitats juvenile salmon need to survive their first year.
Restoration teams systematically removed culverts and other barriers that prevented salmon from reaching upstream spawning grounds, reconnected rivers to their floodplains to create slow-water refuges for young fish, and reintroduced large wood structures that create the pools and cover essential for salmon survival. In the Gualala River watershed alone, coho returned to tributaries where they hadn't been seen in more than 20 years.
Partnership proved essential to success. The Nature Conservancy, Trout Unlimited, and timber companies including worked together to design restoration projects that benefited both salmon and working landscapes. Projects focused on restoring natural stream processes rather than simply building structures—allowing rivers to create and maintain their own salmon habitat over time.
