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12th Line Bridge

12th Line Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: July 21, 2012

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Key Facts

Facility Carried / Feature Intersected
12th Line Over Grand River
Location
Rural: Dufferin County, Ontario: Canada
Structure Type
Concrete Rainbow Through Arch, Fixed
Construction Date and Builder / Engineer
1921 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
2019
Main Span Length
80 Feet (24.38 Meters)
Structure Length
160 Feet (48.77 Meters)
Roadway Width
Not Available
Spans
2 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

Bridge Status: 2019: Eric May reports that this bridge is undergoing rehab of its vertical members.

This bridge is an example of a concrete rainbow arch, also called a concrete bowstring bridge. It stands out as noteworthy for the length of its spans as well as its multi-span configuration. Perhaps the most striking feature of the bridge however is its heavy skew. Aside from the arches being offset from each other to accommodate this arch, the single overhead brace for each span does not follow the skew angle, so it does not meet at the same location on the arch at each end of the brace. The bridge is simple in appearance, with the arch's inherent graceful shape and appearance being the main form of aesthetic detail, although the railing does have some architectural embellishment. One interesting aspect of the bridge is it does not appear that the contractor put a large amount of effort into maintaining a perfect curve to the arch. Slight variances in the curve of the arch are discernable to the naked eye without too much difficulty. This is a contrast to some old concrete bridges where every curve and every detail was constructed to as close to perfection as possible.

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Photo Galleries and Videos: 12th Line Bridge

 
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Bridge Photo-Documentation
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Southeastbound Crossing
Full Motion Video
Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.
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Northwestbound Crossing
Full Motion Video
Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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