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Evans Bridge

Evans Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 3, 2013

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Key Facts

Facility Carried / Feature Intersected
Iams Hill Road (TR-372) Over 10 Mile Creek
Location
Rural: Washington County, Pennsylvania: United States
Construction Date and Builder / Engineer
By Builder/Contractor: Penn Bridge Company of Beaver Falls, Pennsylvania

Technical Facts

Rehabilitation Date
1949
Main Span Length
90 Feet (27 Meters)
Structure Length
94 Feet (29 Meters)
Roadway Width
15 Feet (4.57 Meters)
Spans
1 Main Span(s)
NBI Number
62720107324040

Historic Significance Rating (HSR)

Bridge Documentation

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

This is an attractive bridge that likely dates to the 1880s. The National Bridge Inventory date of 1949 likely refers to the abutments, which are concrete and much newer than the 1880s. It is not known if this bridge sits in its original location, and the abutments were just replaced in 1949, or if this truss bridge was relocated here in 1949.

This bridge has distinctive details of the Penn Bridge Company design. It is similar to the Coal Center Bridge. The Evans Bridge has a portal bracing that has lost nearly all of the distinctive decorative Penn Bridge Company buttons on the lattice of the portal bracing. These buttons would have included a variety of images on them, including what looks like the Liberty Bell, and also the word "Penn." The bridge also has the unusual design detail of two pins at the end of the top chord, one for the hip vertical and one for the diagonal member, another typical Penn Bridge Company detail. The Historic Bridge Inventory thought that the Groton Bridge Company built this bridge. This is totally incorrect, and it is completely unclear where that would come from.

Some of the counter diagonal members on this bridge have been cut and welded with a odd-looking plate to create a splice. Why would such an alteration be made? It is not clear. Hopefully it wasn't because somebody thought the original turnbuckles could not be adjusted because they were rusty. Rusty nuts, bolts, and turnbuckles on historic bridges can all be made operable by heating the nut or turnbuckle, which enlarges the metal and breaks it lose, enabling it to be turned, even if it has rusted and not been turned for decades.

Information and Findings From Pennsylvania's Historic Bridge Inventory

Discussion of Bridge

The ca. 1890 one span, 94' long, pin connected Pratt thru truss bridge is supported on stone abutments. The trusses are traditionally composed except for the unusual double pin detail at the upper hip panel point. One pin is for the eye bar floor beam hanger and the other is for the diagonal. The shaped, built up floor beams are original. Modern turnbuckles have been added to spliced into the original diagonals by welded connections. Otherwise the bridge appears to be complete. The fabricator is not documented in available records, but the bridge is historically and technologically significant as an example of the techonology prior to it becoming standardized. The bridge is attributed to the Groton Bridge Co. of New York.

Discussion of Surrounding Area

The bridge carries a 2 lane road over a stream south of a crossroads settlement composed of mid-19th through modern houses. There are 19th century houses that may be potentially eligible beyond the SW and NE quadrants, but there are modern ones beyond the NE one. The settlement does not have the cohesiveness and concentration of resources to be a potential historic district.

Bridge Considered Historic By Survey: Yes

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Photo Galleries and Videos: Evans Bridge

 
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Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
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Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Video
CarCam: Southbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.
View Video
CarCam: Northbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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Maps and Links: Evans Bridge

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