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Martin Street Bridge

Mill Street Bridge

Martin Street Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: October 4, 2016

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Facility Carried / Feature Intersected
Martin Street (Mill Street) Over South Saugeen River
Wellington North (Mt. Forest): Wellington County, Ontario: Canada
Structure Type
Metal 6 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
By Builder/Contractor: Central Bridge and Engineering Company of Peterborough, Ontario and Engineer/Design: William H. Law of Peterborough, Ontario
Rehabilitation Date
Not Available or Not Applicable
Main Span Length
Not Available
Structure Length
Not Available
Roadway Width
Not Available
1 Main Span(s) and 2 Approach Span(s)
Inventory Number
Not Applicable

Historic Significance Rating (HSR)
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Bridge Documentation

This bridge is a rare surviving example of a pin-connected truss bridge in Ontario. Although the builder plaque has been mostly destroyed, enough of the distinctive circular channel border remains to be certain that this bridge was the work of the Central Bridge and Engineering Company. Other details associated with the company is the use of unusual cover plate splices about halfway up the endposts, as well as a distintive portal bracing design which switches to plate at the ends with cutouts angled to match the angles of the interior lattice pattern. These two design details are found on multiple bridges by this company. The northern approach spans and the northern concrete substructrues may not be original to the bridge. At the south end of the bridge, the truss is supported by riveted caissons, which likely are original. The caissons are capped with cast iron caps (instead of riveted plate which was more common). Also unusual are the bearings which are also cast iron. Based on other bridges by this company in Ontario, a ca. 1890s construction date seems reasonable. However, the unusual cast iron bearings might suggest this is an earlier bridge, perhaps even dating to the 1880s.

This bridge has been redecked and left in place for non-motorized traffic. There is one area of maintenance concern noted: A tree of substantial size has completely grown around one of the lower chord eyebars. Thought should be given to removing this tree. This bridge is a pin-connected truss bridge that functions best when its connections can flex freely, and the tree may be restricting this, as well as causing additional unknown stresses in the bridge for which it was not designed for.


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Maps and Links: Martin Street Bridge

This bridge is on a section of former road that is today intended for non-motorized traffic only as part of a local trail system.

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