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20th Avenue NE Bridge facts for kids

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20th Avenue NE Bridge
A steel-arched bridge over a wooded ravine
Other name(s) Ravenna Park Bridge
Heritage status National Register of Historic Places, Seattle city landmark
Design Deck Arch
Material Steel
Total length 354 feet (108 m)
Width 18-foot (5.5 m)
Clearance below 41 feet (12 m)
Designer Frank M. Johnson
Engineering design by Arthur Dimock
Opened 1913
Closed 1975 (to vehicles only)
Designated: January 17, 1977

The 20th Avenue NE Bridge (also known as the Ravenna Park Bridge) is a three-hinged, steel, lattice-arched bridge that spans a ravine in Seattle's Ravenna Park. It was designed by Frank M. Johnson under the direction of city engineer Arthur Dimock. Built in 1913, the structure is both listed in the National Register of Historic Places and is a designated city landmark.

The structure is 354 ft (108 m) long. It has a 250 ft (76 m) arch that rises 41 ft (12 m) over the ravine. It supports an 18 ft (5.5 m) reinforced concrete roadway. Beginning on March 11th, 1975, a four-month trial began wherein the bridge was closed to vehicular traffic. The bridge did not meet the standards for arterial roads at the time, and upgrading the bridge would have been cost prohibitive. but it is accessible by pedestrians and cyclists.

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