HistoricBridges.org Menu: HistoricBridges.org Menu:

Divider

HistoricBridges.org: Bridge Browser

Advertisements:
Bach Steel - Experts at historic truss bridge restoration.

Divider

Old Williams Road Bridge

   


Old Williams Road Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: July 15, 2011
View Photos
and Videos
View Maps
and Links

Key Facts

Facility Carried / Feature Intersected
Old Williams Road Over Town Creek
Location
Rural: Allegany County, Maryland
Structure Type
Metal 5 Panel Pin-Connected Pratt Full-Slope Pony Truss, Fixed and Approach Spans: Metal 4 Panel Rivet-Connected Warren (No Verticals) Pony Truss, Fixed
Construction Date and Builder / Engineer
1910 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
1977
Main Span Length
73.2 Feet (22.3 Meters)
Structure Length
141 Feet (43 Meters)
Roadway Width
14 Feet (4.3 Meters)
Spans
1 Main Span(s) and 1 Approach Span(s)
NBI Number
200000A-0111010

Historic Significance Rating (HSR)

Bridge Documentation

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

View The Historic Bridge Inventory Report For This Bridge

This bridge is composed of two spans from two different eras of construction. The southwestern truss span is a pin-connected Pratt truss of 72.5 feet in length. The northeastern span is a 65 foot rivet-connected Warren pony truss. Commonly, when two different spans are found like this, usually the pin-connected span is the older and original span, and the rivet-connected span would be newer, having been installed when for some reason the original span failed. The Historic Bridge Inventory does not comment or speculate on this possibility for this bridge. Stylistically, the Warren pony truss appears to be an early example of its type, while the Pratt truss appears to be a late example of its type. The 1910 date would be plausible even for the presumed newer Warren truss span. Thus there is a possibility that both spans were erected at the same time, however this would be unusual to see such variances in construction design used at the same time.

The Pratt truss stands out for having very tall trusses for a pony truss. Longer truss spans result in taller truss spans, but this bridge the ratio of length to height appears to favor a taller than normal truss. The Warren pony truss span is noteworthy for its complete lack of vertical members, which is rare among Warren truss bridges. With no verticals in the way, the floor beams rest directly on top of the bottom chord connection gusset plates.

In 1977, the Warren truss span had supplemental bents added under the bridge to bear the load of traffic.

Divider

Photos and Videos: Old Williams Road Bridge

Available Photo Galleries and Videos

Click on a thumbnail or gallery name below to visit that particular photo gallery. If videos are available, click on a video name to view and/or download that particular video.

 
View Photo Gallery
Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. For the best visual immersion and full detail, or for use as a desktop background, this gallery presents the photos for this bridge in the original digital camera resolution.
View Photo Gallery
Bridge Photo-Documentation
Mobile Optimized Gallery
A collection of overview and detail photos. View the photos for this bridge in a reduced size which is useful for mobile/smartphone users, modem (dial-up) users, or those who do not wish to wait for the longer download times of the full-size photos. Alternatively, view this photo gallery using a popup slideshow viewer (great for mobile users) by clicking the link below.
Browse Gallery With Popup Viewer

View Maps
and Links

Divider
 
Home Top

Divider

About - Contact

© Copyright 2003-2017, 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.