This bridge is built to a particular design and truss configuration that was built throughout Ontario and of which a small collection of examples still remain today to represent the design and the characteristics which define the group. Although the design is found on multiple bridges in Ontario, outside of Ontario the design of these bridges would be classified as extremely unusual and rare. Two elements make the design unusual. First, the truss configuration is a subdivided double-intersection Warren. This means that in addition to a vertical member between each "X" of diagonal members, there is also a vertical member that passes right through the center of each "X." Double-intersection Warrens are uncommon, but subdivided double-intersection Warren truss bridges are very unusual. The other unusual feature of these bridges is the shallow slope of the end post, which results in an unusually long endpost. As a result of this unusually long end post design, there is an additional vertical and diagonal member that connect to the endpost halfway up, and there is also a floorbeam under the vertical member.
The Jamestown Line Bridge is a typical example of this design. The bridge retains good historic integrity, although some of the original lattice railing panels have been replaced, but they appear to have been replaced with lattice railings likely originally from another old bridge, so the bridge retains a historical appearance. The deck is wooden.
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