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Boston Bridge

   
                  


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Bridge Documented: July 12, 2009
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Key Facts
Bridge Name Facility Carried / Feature Intersected Location Structure Type Construction Date and Builder/Engineer
Boston Bridge
Walnut Street (PA-48 - Orange Beltway) Over Youghiogheny River Versailles: Allegheny County, Pennsylvania Metal Cantilever 18 Panel Rivet-Connected Warren Through Truss, Fixed and Approach Spans: Metal Deck Girder, Fixed 1931 By Builder/Contractor: Fort Pitt Bridge Works of Pittsburgh, Pennsylvania
Technical Facts
Rehabilitation Date Main Span Length Structure Length Roadway Width Main Spans Approach Spans NBI Number
1989 420 Feet (128 Meters) 1182 Feet (360.3 Meters) 29.5 Feet (9 Meters) 3 5 20048013002030

Historic Significance Rating (HSR)

Primary Photographer(s): Nathan Holth and Rick McOmber

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This impressive bridge which is considered eligible for the National Register of Historic Places, is a striking and impressive cantilever bridge that is very unlike most cantilever bridges encountered. The bridge was designed to look highly attractive, and as such the sway bracing on this bridge is designed as unusual large arch shapes, and the top chord of the cantilever is carefully designed especially between the towers to have a very smooth curved appearance to the bridge. The curve is designed so that the top chord sweeps far lower that in most cantilever bridges, which is only possible because the bridge has sway bracing only in the vicinity of the towers, yet another unusual feature of this bridge. The bridge is a cantilever bridge, and two hinges at the bottom chord define a six panel suspended span at the center of the bridge, although visually this is almost impossible to see with a casual view. The bridge's diagonal and vertical members are all rolled beams, and the top chord is a built-up box beam with lattice on the bottom, which is the only place in which lattice occurs on the bridge. No v-lacing is present. At least some and perhaps all the steel on the bridge was fabricated by Carnegie.

Original pedestrian railings remain on the bridge, and low profile New Jersey barriers were added to protect the trusses from vehicular traffic.

The bridge is historically and technologically significant as a unusual execution of the cantilever truss bridge type, and for retaining a good degree of historic integrity.

This highly attractive bridge is a very important bridge among Allegheny County's vast collection of historic bridges. Its preservation is essential.

 

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Photos and Videos: Boston Bridge

Available Photo Galleries and Videos

Click on a thumbnail or gallery name below to visit that particular photo gallery. If videos are available, click on a video name to view and/or download that particular video.

 
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A collection of overview and detail photos. For the best visual immersion and full detail, or for use as a desktop background, this gallery presents the photos for this bridge in the original digital camera resolution.
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A collection of overview and detail photos. View the photos for this bridge in a reduced size which is useful for mobile/smartphone users, modem (dial-up) users, or those who do not wish to wait for the longer download times of the full-size photos. Alternatively, view this photo gallery using a popup slideshow viewer (great for mobile users) by clicking the link below.
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