Artificial beaver dams saw juvenile coho salmon survival rates go from 8% to 60%
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Artificial beaver dams in California boosted juvenile coho salmon survival from 8% to 60%.
In California's Scott River valley, beaver extirpation by 1830s trappers eliminated wetland habitat for threatened coho salmon. Starting in 2015, the Scott River Watershed Council built artificial dams from wood, willow, and mud on Sugar and French Creeks. The dams created 9,000 m² of new habitat, kept water cooler, and raised juvenile survival from 8% to 60%. Two years later, Scott River had the highest returning salmon numbers among monitored rivers, even during drought.
What commenters are saying
Commenters questioned why beavers weren't simply reintroduced. Several replied that landowners often oppose beavers due to flooding, property damage, and liability issues, and that wetlands regulations can make land management onerous. Others noted beavers can overpopulate without predators and require active management. A few pointed out that artificial dams offer a low-cost alternative for water retention and aquifer recharge, and that similar projects are underway in Europe.