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River, northwestern Oregon, U.S. It flows north for 300 mi (485 km) into the Columbia River near Portland. Oregon's most populous cities are in its valley. The Fremont Bridge, a steel arch with a main span of 1,225 ft (373 m), crosses the river at Portland.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Willamette River, visit Britannica.com.
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