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Salisbury Street Bridge

   


Salisbury Street Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: July 15, 2011
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Key Facts

Facility Carried / Feature Intersected
Salisbury Street Over Chesapeake and Ohio Canal
Location
Williamsport: Washington County, Maryland
Structure Type
Metal 8 Panel Pin-Connected Pratt Full-Slope Pony Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1879 By Builder/Contractor: Wendel Bollman of Baltimore, Maryland

Technical Facts

Rehabilitation Date
2006
Main Span Length
67 Feet (20.4 Meters)
Structure Length
107.3 Feet (32.7 Meters)
Roadway Width
9.5 Feet (2.9 Meters)
Spans
1 Main Span(s) and 1 Approach Span(s)
NBI Number
3100009P

Historic Significance Rating (HSR)

Bridge Documentation

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

View The Historic Bridge Inventory Report For This Bridge

This bridge was designed and built by Wendel Bollman, inventor of the Bollman truss configuration. This is not a Bollman truss however. Instead, it is a very old example of a pin-connected Pratt truss. As a pony truss, it has very small panels, giving this 67 foot span eight panels, a very large number of panels for a bridge of this size. The bridge no longer bears the weight of traffic, since steel stringers have been added between the deck and the floor beams to support traffic. The truss only supports its own weight. While preservationists with engineering  interests likely would condemn this preservation project because the truss no longer bears any live load, preservationists who value integrity of original design and materials will find this to be a good compromise preservation solution. Because the stringers support the load, alteration or retrofit of the truss was not needed. The manner in which the stringers was added is sensitive. They are located above the floor beams, so they are not readily visible, and they have the appearance of oversized deck stringers, so they do not stick out even when  seen. Also important is that the floorbeams or trusses were not altered. The stringers slip right in above the floorbeams without disturbing the truss.

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Photos and Videos: Salisbury Street Bridge

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Bridge Photo-Documentation
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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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Westbound Crossing
Full Motion Video
Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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