About the Willamette Valley
The Willamette Valley is the most populated region in the state of Oregon of the United States. Located in the state’s northwest, the region is surrounded by tall mountain ranges to the east, west and south and the valley’s floor is broad, flat and fertile because of Ice Age conditions. Located centrally inside the large alluvial-deposited soils of the Willamette River drainage basin, the valley spreads far from the river banks to both the east and west barrier ranges as the river proceeds northward from its emergence from the Calapooya Mountains near Eugene to the confluence of the Willamette with the Columbia River at Portland.
Oregon Department of Transportation
- State Highway Freight System (PDF)