It remains unclear why Queenpost truss bridges are often cast aside as "Pratt" truss bridges, as was done with this bridge in the Historic Bridge Inventory. Queenpost truss bridges should not be considered Pratt truss bridges. Queenpost truss bridges represent a design that was used, particularly in the earlier truss bridge era, to create small spans during a time that steel stringers bridges were not economical due to the limits in size of rolled beams. Although a bridge like this one is a late example, it still represents this truss configuration that was a solution for crossings where a three panel bridge was effective. Truss bridges of this length would not be built often into the 20th Century as steel stringer became common for short span applications.
This bridge was however seriously altered when stringers were added below the trusses. This alteration sets this structure behind other Queenpost bridges found elsewhere, but it remains regionally significant where few other Queenposts are to be found.
Information and Findings From Pennsylvania's Historic Bridge Inventory
Discussion of Bridge
The ca. 1910, riveted, Pratt pony truss bridge with outriggers was altered in 1949 when built up stringers were placed below the existing floorbeams. The stringers carry much of the live load. The trusses have minor welded repairs, and they are a common design that is common throughout southwestern Pennsylvania. The bridge, which has no innovative or distinctive details, is not historically or technologically significant.
Discussion of Surrounding Area
The bridge carries 1 lane of an unimproved road over a stream in a wooded and mixed use area at the southeast end of Somerset.
Bridge Considered Historic By Survey: No
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.
|A collection of overview and detail photos. This photo gallery contains a combination of Original / Full Sized photos and Mobile/Smartphone Optimized (Reduced Size) photos. Alternatively, view this photo gallery using a popup slideshow viewer by clicking the link below.
Browse Gallery With Popup Viewer
© Copyright 2003-2018, HistoricBridges.org. All Rights Reserved. Disclaimer: HistoricBridges.org is a volunteer group of private citizens. HistoricBridges.org is NOT a government agency, does not represent or work with any governmental agencies, nor is it in any way associated with any government agency or any non-profit organization. While we strive for accuracy in our factual content, HistoricBridges.org offers no guarantee of accuracy. Information is provided "as is" without warranty of any kind, either expressed or implied. Information could include technical inaccuracies or errors of omission. Opinions and commentary are the opinions of the respective HistoricBridges.org member who made them and do not necessarily represent the views of anyone else, including any outside photographers whose images may appear on the page in which the commentary appears. HistoricBridges.org does not bear any responsibility for any consequences resulting from the use of this or any other HistoricBridges.org information. Owners and users of bridges have the responsibility of correctly following all applicable laws, rules, and regulations, regardless of any HistoricBridges.org information.