20th Avenue NE Bridge

The 20th Avenue NE Bridge ''' is a three-hinged, steel, lattice-arched bridge that spans a ravine in Seattle, Washington, United States' 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 long. It has a arch that rises over the ravine. It supports an reinforced concrete roadway. Beginning on March 11, 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. The trial period was successful and the bridge has been closed to vehicle travel ever since, but it is accessible by pedestrians and cyclists.