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Gerloff Road Bridge

Gerloff Road Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: May 30, 2010

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Facility Carried / Feature Intersected
Gerloff Road Over Swamp Creek
Location
Rural: Montgomery County, Pennsylvania: United States
Construction Date and Builder / Engineer
1888 By Builder/Contractor: Unknown
Rehabilitation Date
1998
Main Span Length
134.0 Feet (40.8 Meters)
Structure Length
138.0 Feet (42.1 Meters)
Roadway Width
22 Feet (6.71 Meters)
Spans
1 Main Span(s)
Inventory Number
46720600302039

Historic Significance Rating (HSR)
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Bridge Documentation

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

 This bridge is highly significant as a rare example of a bridge which uses the rare patented wrought iron Phoenix Columns, which are a special type of built up beam that have their distinctive circular sections riveted together to form hollow tubes. Very few bridges with these types of columns remain today.

The bridge  has been retrofitted and rendered decorative with a steel arch. The steel arch is a way to bypass the truss/superstructure, while continuing to reuse the deck stringers and deck system. They appear to be used both in the name of simple repair projects and also in the name of historic preservation, and tend to show up on older rehab and preservation projects from a decade or two ago and do not show up as often today. As a preservation tool they are one of many compromise preservation alternatives. As preservation tools, arch retrofits are compromise tools because they drastically alter the appearance of the bridge, since as a through arch running through the truss, it is hard for eyes to separate arch from truss visually. Depending on how they are designed, they can help retain original bridge material, or they can cause the replacement of large portions of original bridge material. In the case of this bridge the entire flooring system appears to have been removed as part of the retrofit, which is unfortunate. Because the truss is rendered decorative only however the crossing can support full legal loads


This bridge is tagged with the following special condition(s): Trusses Converted To Decorative and Phoenix Columns

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Photo Galleries and Videos: Gerloff Road 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.
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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.
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View Video

Driving Northeast Over 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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View Video

Driving Southwest Over 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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View Video

Driving Northeast Over 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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Maps and Links: Gerloff Road Bridge

Coordinates (Latitude, Longitude):

Search For Additional Bridge Listings:

Bridgehunter.com: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

Bridgehunter.com: View listed bridges within 10 miles (16 kilometers) of this bridge.

HistoricBridges.org Bridge Browser: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

HistoricBridges.org Bridge Browser: View listed bridges within 10 miles (16 kilometers) of this bridge.

2021 National Bridge Inventory: View listed bridges within 0.5 miles (0.8 kilometers) of this bridge.

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