An extraordinary resurgence of endangered coho salmon has brought new hope to central California's coastal waterways, where scientists documented 30,000 fish returning to Mendocino coast rivers during the most recent season—a tenfold increase over the 3,000-fish average recorded throughout the previous decade.
The population surge also represents a doubling from the prior season's totals, marking what researchers describe as an achievement many believed they would never witness during their professional careers.
"I am overjoyed—everybody's just ecstatic about how many coho there are," said Joe Pecharich, a Marine Habitat Resource Specialist with the National Oceanic and Atmospheric Administration, speaking to Good News Network. Pecharich has spent two decades supporting habitat improvement initiatives throughout the region. "We have conducted intensive sampling since 2009 in these watersheds and many of us never thought we'd see something like this in our lifetime."
The central California coast coho salmon represents the most imperiled population segment within the broader coho species. Across numerous waterways, these fish had vanished entirely, reduced to historical footnotes rather than living populations.
According to a March news release from NOAA, the dramatic recovery signals that focused restoration work on private property can produce measurable results for species once teetering near extinction.
"It's very good news for all of us—communities, tribes, NGOs, NOAA, California Department of Fish and Wildlife, and all our partners," said Joshua Fuller, Coastal California Branch Supervisor for NOAA, speaking to Good News Network. "Recovering salmon is undeniably challenging, particularly for a species that must successfully navigate both freshwater and marine ecosystems during its lifetime. These numbers are very encouraging and demonstrate that recovery is possible when management, habitat, ocean, and hydrologic conditions are aligned."
Beginning before the year 2000, NOAA assembled an extensive partnership that brought together diverse interests including tribal nations, environmental organizations, state wildlife officials, forestry operations, and fishing advocacy groups such as Trout Unlimited. Together, these stakeholders have completed more than 100 improvement projects designed to restore optimal conditions for coho salmon across river systems flowing into the Mendocino coast.
The restoration work has addressed numerous obstacles that prevented salmon from thriving. Crews have widened road culverts that were too narrow for fish passage, cleared blockages including log jams, and restored streams that had been artificially straightened back to their natural winding courses.
Improvements have been implemented across multiple watershed systems, including the Garcia, Big, Noyo, and North Fork Navarro rivers. During the summer preceding the record salmon return, NOAA partnered with The Nature Conservancy to complete the Ten Mile watershed's most extensive habitat restoration project to date.
"It's been amazing to see how quickly coho will occupy new habitat. Just days after the excavators roll out, the fish will start to swim in," said Peter van de Burgt, who manages North Coast restoration initiatives for The Nature Conservancy, speaking to Good News Network.
The recovery extends beyond sheer numbers to geographic scope. Usal Creek had not recorded a living coho salmon in 10 years. The Gualala River watershed had gone two decades without documented coho presence. Both waterways now host adult salmon migrating upstream to spawn and juvenile fish traveling downstream toward the ocean.
Population assessments conducted through spring of this year suggest the robust trend continues. Early monitoring on the North Fork Navarro River alone has documented 400 coho salmon—a figure that substantially exceeds typical projections for the waterway.
