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McPherson Bridge

Concession Road 8 Bridge

McPherson Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: April 15, 2015

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Key Facts

Facility Carried / Feature Intersected
Concession Road 8 Over Teeswater River
South Bruce: Bruce County, Ontario: Canada
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
110 Feet (33.5 Meters)
Structure Length
110 Feet (33.5 Meters)
Roadway Width
Not Available
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge is nearly identical to the Dudgeon Bridge's truss span seen on, and the two truss spans may share a common history, since the Dudgeon Bridge's truss span is a relocated span, this truss on Concession Road 8 may be similarly relocated. The Dudgeon Bridge's lattice truss span was reportedly a former railway span that was reconfigured for highway use. Both spans may have come from the same original bridge, in an unknown location. Despite the similarities of these two bridges, both bridges are otherwise unique among the thousands of bridges in Canada and the United States on HistoricBridges.org. These two bridges may be the only examples of their kind in North America. Quadruple Warren truss bridges in North America generally are found as through or deck truss bridges, not pony truss bridges. The bridges, with their lattice pony truss configuration and unusual vertical end posts, are strongly reminiscent of a European style of bridge known as a lattice girder bridge. Europe's lattice girder bridges generally will have lighter and more numerous diagonal members forming a very tight lattice, but the overall visual appearance is strikingly similar. European lattice girder bridges are often pony truss bridges.

Please visit the Dudgeon Bridge page for a more detailed discussion about these two bridges and the features that make them unique and among the most significant heritage bridges in Ontario, a distinction that it is sadly unrecognized by local residents and government, particularly with this bridge. The bridge did make an appearance in an undated photo on a website with family photos from the collection of Catherine Taylor-Lamb and Lizzie Lamb-Kincaid who apparently had a farm near the bridge. The photo below was captioned as "new bridge." It was also labeled Gregg's Bridge, which may be the local name for this bridge.

Unlike the Dudgeon Bridge, the Concession Road 8 shows some empty rivet holes, located on a couple of the end posts. These empty holes show where a diagonal member used to be located but is today missing. It is not known why the diagonal member is missing, and whether it has anything to do with the relocation of the bridge.


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