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Line 12 Bridge

Trafalgar Bridge

Line 12 Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 25, 2014

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Key Facts

Facility Carried / Feature Intersected
Line 12 Over North Branch Thames River
Location
Rural: Perth County, Ontario: Canada
Construction Date and Builder / Engineer
1905 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
135 Feet (41 Meters)
Structure Length
143 Feet (44 Meters)
Roadway Width
12.8 Feet (3.9 Meters)
Spans
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

This bridge no longer exists!

Bridge Status: Demolished.

This bridge is a rare surviving example of a pin-connected through truss bridge in Ontario. While the bridge is a traditional example of its type overall, the bridge has several noteworthy unusual details.

The vertical members which are composed of back-to-back channels with lacing have cutouts at the bottom of the channels for the diagonal members of the truss to pass through. Of interest is the cutouts were made by drilling a series of small holes in a line, a technique used to cut metal in the shop before cutting torches were around. Of further interest on this specific bridge is the extremely crude nature of the cutouts. The holes barely line up and do not even form a straight line in many places. Whoever was responsible for making the cutouts when this bridge was fabricated either didn't care about the details or was under the influence! Another interesting detail is that these cutouts are present at the bottom of all the vertical member channels, including ones that do not require and do not have any diagonal members passing through them. This suggests that either nobody thought through which channels would need the cutouts in reality, or the builder simply did not have to worry about it and wanted it so all the verticals would work wherever they were located or positioned.

The bottom chord of the bridge has an unusual detail at the end panels, where rare ribbon lacing (could also be called corrugation) is present. This is a detail that is extremely rare on highway bridges, and is more often found on railway bridges. The exact reasoning for the stiffening of end panel bottom chord in a truss bridge is unclear, however logic suggests that engineers must have expected the end panel bottom chord to perhaps be on occasion be subjected to additional forces beyond that which the rest of the bottom chord would normally experience.

Finally, there is an unusual detail with the hip verticals. The bottom of the hip vertical splits to form a rare double-eye design.

This bridge is in a rural location and is deserving of preservation. The bridge retains integrity of its unusual details and the majority of its original materials. The main alteration noted with the bridge was the replacement of end post and top chord plate, which was originally riveted, with new plate which is bolted on.

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Photo Galleries and Videos: Line 12 Bridge

 
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Maps and Links: Line 12 Bridge

This historic bridge has been demolished. This map is shown for reference purposes only.

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