HistoricBridges.org Menu: HistoricBridges.org Menu:


We Recommend These Resources:
Bach Steel - Experts at historic truss bridge restoration.
Historic Bridge Finder App: Find Nearby Bridges

HistoricBridges.org: Bridge Browser

Gerloff Road Bridge

Gerloff Road Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: May 30, 2010

View Photos
and Videos
View Maps
and Links

Key Facts

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

Technical Facts

Rehabilitation Date
1998
Main Span Length
134 Feet (40.84 Meters)
Structure Length
138 Feet (42.06 Meters)
Roadway Width
22 Feet (6.71 Meters)
Spans
1 Main Span(s)
NBI Number
46720600302039

Historic Significance Rating (HSR)

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

Divider

Photo Galleries and Videos: Gerloff Road Bridge

 
View Photo Gallery
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
View Photo Gallery
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
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.
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.
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.

View Maps
and Links

Divider
 
Home Top

Divider

About - Contact

© Copyright 2003-2019, 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.