March 5, 2025 — Last winter, endangered Central California Coast coho salmon (CCC coho) returned to Mendocino Coast rivers and streams in the highest numbers since monitoring began 16 years ago. Monitoring led by the California Department of Fish and Wildlife to track their population status estimated more than 15,000 adult CCC coho returned to spawn during the 2023–24 season. The Ten Mile and Noyo rivers exceeded recovery targets set by NOAA for delisting CCC coho under the Endangered Species Act, and the Big and Garcia rivers experienced record returns.
While the overall numbers remain low compared to the species’ past abundance, NOAA scientists are excited by the results.
“I remember in the 1990s monitoring streams where water temperatures were too hot for CCC coho and lacking in structure, and I thought they would never come back in my lifetime,” says NOAA San Joaquin River Branch Chief Jonathan Ambrose. “I’ve been at NOAA Fisheries for 25 years, and we’ve changed the trajectory for CCC coho salmon. A lot of people think it’s too late—it’s too hard to bring back endangered species. This is a prime example of why it’s not too late or too hard.”