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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.
I think most regard it going down (as the river runs) through Portland. I-5 runs along the west side of the valley from Wilsonville north. 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.