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Burlington Northern Railroad Bridge 5.1The Burlington Northern Railroad Bridge 5.1, also known as the St. Johns Railroad Bridge, is a truss bridge with a vertical lift that spans the Willamette River in Portland, Oregon. The Burlington Northern Railroad owns the bridge, and the 5.1 denotes the rail mileage from Portland's Union Station. The first bridge was built by Northern Pacific Railroad in 1908 as the longest swing span bridge in the world. It was replaced by a vertical lift bridge that was completed in 1989 at a cost of $38 million. This 516 ft. long lift span is the fourth highest in the world, providing vertical clearance of 200 ft. Books Wood, Sharon. The Portland Bridge Book. Portland: Oregon Historical Society, 2001. ISBN 0-87595-211-9.
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