Wild Salmon Habitat: Dam Removal and River Restoration

Wild salmon depend on unobstructed rivers for migration and spawning. Dam removal and river restoration programmes are proving to be transformative for salmon population welfare and ecosystem health.

Key Facts

There are seven Pacific salmon species and one Atlantic salmon species, all requiring cool, clean rivers for spawning.
An estimated 1,000 dams have been removed in the US since 1912, with accelerating pace in recent decades.
The removal of the Elwha River dams in Washington State triggered the fastest river ecosystem recovery ever documented.
Salmon can sense Earth's magnetic field and use it to navigate thousands of kilometres back to their birth streams.
Atlantic salmon populations in many European rivers are at historic lows due to dam blockages, overfishing, and pollution.
Salmon carcasses bring marine nutrients deep into forest ecosystems, supporting hundreds of species from bears to fungi.
Upstream migration past dam fish ladders imposes significant physiological stress on migrating salmon.

Welfare Considerations

Wild salmon welfare is fundamentally a river health issue. Dams block migration routes, preventing access to spawning habitat and forcing fish to navigate fish ladders that impose energetic and physiological costs. Warm water temperatures from climate change push salmon toward thermal stress limits in rivers that were historically cooler. Agricultural pollution degrades water quality and spawning gravel. Dam removal is the most impactful single intervention for salmon welfare — post-removal recovery has consistently exceeded scientific predictions. Restoring connected river systems allows salmon to fulfil their complete life cycle without the welfare costs of blocked migration, degraded habitat, and compromised spawning success.

What You Can Do

Support American Rivers, Salmon & Trout Conservation, and Wild Salmon Center dam removal campaigns.
Advocate for river connectivity requirements in hydropower licensing and renewal processes.
Reduce agricultural runoff impacts by supporting conservation-focused farming practices in salmon watersheds.
Choose wild-caught salmon from MSC-certified fisheries with healthy, managed populations.
Engage with climate change policy — reducing warming protects river temperatures for salmon survival.