The Willamette River is a
tributary of the
Columbia River, long, in northwestern
Oregon in the
United States. Flowing northward between the
Coastal Range and
Cascade Range, the river and its tributaries form a basin called the
Willamette Valley containing 68% of Oregon's population, including its largest city
Portland, which sits along both sides of the river near its mouth on the Columbia. Its lush valley is fed by prolific rainfall on the western side of the Cascades, forming one of the most fertile
agricultural regions of
North America that was the destination for many if not most of the emigrants along the
Oregon Trail. The river was an important transportation route throughout much of the early history of the state, furnishing a means of conveying the vast timber and agricultural resources of the state to the outside world.
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