Built in 1966 and named for P. A. Marquam, a county judge, this four-lane, double-decker monstrosity is also known as the I-5 Bridge. The much-needed span is not one of Portland's prettiest bridges, but the view should not be missed. Get the most sensational panorama from the eastbound lanes. Keep your eyes peeled—at 55 mph, the scene practically flashes before you. And be careful: bridge traffic is often dense and dangerous.
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