The Columbia River estuary and plume: natural variability, anthropogenic change and physical habitat of salmon

Traditional salmon recovery efforts in the Columbia River have relied heavily on hatcheries and technological fixes, yet these strategies have failed to reverse long‑term population declines. Scientists now recognize that these approaches overlooked the ecological processes that support salmon resilience, particularly the connections among marine, estuarine, and riverine habitats. A new paradigm emphasizes the full estuary‑to‑plume‑to‑shelf continuum as essential for maintaining the diversity of salmon life histories needed to withstand environmental change. The CORIE/SATURN coastal margin observatory system provides advanced monitoring and modeling capabilities that can help address key scientific questions emerging from this shift and guide more effective salmon recovery strategies.