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| Key Facts |
| Bridge Name | Facility Carried / Feature Intersected | Location | Structure Type | Construction Date and Builder/Engineer | |
|---|---|---|---|---|---|
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Portersville Road Bridge
| Portersville Road (PA-488) Over Slippery Rock Creek | Rural: Lawrence County, Pennsylvania | Metal 6 Panel Rivet-Connected Pratt Through Truss, Fixed | 1932 By Builder/Contractor: Unknown and Engineer/Design: Pennsylvania State Highway Department |
| Technical Facts |
| Rehabilitation Date | Main Span Length | Structure Length | Roadway Width | Main Spans | NBI Number |
| 1984 | 155 Feet (47.2 Meters) | 310 Feet (94.5 Meters) | 23.6 Feet (7.2 Meters) | 2 | 370488006000000 |
This bridge is a heavily skewed state standard plan truss bridge. V-lacing is only present on the overhead bracing, and lattice is only under the top chord, while vertical and diagonal members are rolled i-beams. Pennsylvania had a wide variety of "standard plan" metal truss bridges, and this design appears to be the last of the through truss designs. The later design is visually distinguished by a less complex appearance, but with many examples that have heavy, and easily noticeable skews and impressive portal bracing with an imposing appearance. These visually pleasing bridges are an asset to Pennsylvania's landscape even if PennDOT does not see them as such.
Information and Findings From Pennsylvania's Historic Bridge InventoryDiscussion of Bridge The skewed, two-span, 310'-long, riveted Pratt thru truss bridge built in 1932 is supported on an ashlar substructure with concrete caps. The upper chords and end posts are built up box sections, and the diagonal members are rolled section. Lower chords are toe in channels with stay plates. The cantilevered sidewalk is finished with a metal lattice railing. Safety shape barriers were placed inside the truss lines in 1984. The bridge has no distinctive or innovative details, and neither it nor its setting are historically or technologically significant. Discussion of Surrounding Area The bridge carries a two-lane road and a sidewalk over a stream in a sparsely developed, rural area with post-World War II houses on both sides of the bridge. Bridge Considered Historic By Survey: No |
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