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| Key Facts |
| Bridge Name | Facility Carried / Feature Intersected | Location | Structure Type | Construction Date and Builder/Engineer | |
|---|---|---|---|---|---|
| ! |
Lynn Avenue Bridge
| Lynn Avenue Over Railroad (Lehigh Valley Railroad) | Bethlehem: Northampton County, Pennsylvania | Metal 10 Panel Rivet-Connected Parker Through Truss, Fixed | 1928 By Builder/Contractor: Unknown |
| Technical Facts |
| Main Span Length | Structure Length | Roadway Width | Main Spans | NBI Number |
| 200 Feet (61 Meters) | 205 Feet (62.5 Meters) | 20 Feet (6.1 Meters) | 1 | 48730100000003 |
This bridge is very similar to the truss approach span seen on the Coplay-Northhampton Bridge. Both spans feature riveted Parker trusses whose bottom chords and floorbeams are encased in concrete, and a truss web largely composed of rolled beams. HistoricBridges.org has slightly better documentation of the approach span on the Coplay-Northampton Bridge, so be sure to view that page to see the concrete encased floor system and lower chord. Truss bridges similar to these two do not appear to be found outside of the Lehigh Valley area, suggesting they may be a county design. The concrete encasement is unusual as is the heavy use of rolled beams, as compared to the more common state standard truss bridges also being built during this period in Pennsylvania.
The ends of the Lynn Avenue Bridge's sidewalk railings terminate with decorative concrete pillars. The Lynn Avenue Bridge also has a earthen approach to provide the elevation needed to cross the railroad tracks.
This bridge is unfortunately slated for demolition and replacement, as is the Coplay-Northampton Bridge. It is most unfortunate that Pennsylvania has chosen to destroy these bridges. It is not known if any additional examples of this design survive. The Lynn Avenue Bridge appears to carry largely residential traffic and it is not a main route. The bridge likely could be rehabilitated for continued vehicular use.
Information and Findings From Pennsylvania's Historic Bridge InventoryDiscussion of Bridge The single span, 205'-long steel Parker thru truss bridge is supported on horizontally scored concrete abutments. Metal guiderails run along the inside faces of the trusses, with lattice railings enclosing the sidewalks. The truss bottom chords and the floor system is encased in concrete. The bottom lateral bracing is not encased. The bridge has been determined historic by the PHMC. Discussion of Surrounding Area The Lynn Avenue Bridge carries a 2 lane road with 2 sidewalks over a railroad yard adjacent to (or in) the Bethlehem Steel Corporation mill in the City of Bethlehem. Bridge Considered Historic By Survey: Yes |
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Bridge Photo-Documentation
Original / Full Size Photos |
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Bridge Photo-Documentation
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Northbound Crossing of the Bridge 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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Southbound Crossing of the Bridge 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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