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The Willamette River is a tributary to the Columbia River, and enters the Columbia at River Mile (RM) 101. It provides the Columbia with approximately 15 percent of its annual discharge. The mouth of the Willamette lies just downstream of Hayden Island, Oregon, and provides the southern shore of Sauvie Island.
Reputation: 8820. Geologically the Willamette Valley runs from Portland and the Columbia River down to where the Coastal Range and Cascade Range start to come together just south of Eugene. From a naming convention aspect most people consider it to be south of the Portland metro area which would start with Aurora and head to just south of Eugene. I would agree that this what most people in the greater Portland area consider to be the Willamette Valley.