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1950 Max L Wilder Memorial Bridge, connecting Arrowsic and Woolwich

The Wilder Bridge is an example of an uncommon, but highly attractive design of truss bridge often called a "arched truss." The design includes a center span that is a through truss with a polygonal top chord, and the truss seamlessly transitions into a deck truss span at each side of the bridge. The design is related to the "suspended-deck truss" however in the arched truss design, the through truss does not rise as far above the roadway and so does not require the deck to be suspended by hangers from the truss. Like the suspended-deck truss, a completed arched truss can either exhibit a cantilever or continuous configuration. The Arrowsic Bridge is a cantilever truss, as evidenced by the pins at particular connection points, providing a hinge, and defining distinct cantilever arms holding a suspended span. Constructed in 1950, this bridge is not a particularly early example of the type (early examples date to the 1930s or earlier) however it is significant in the state context since it is the only known example of its type in Maine, and was additionally designed by noteworthy Max L. Wilder of the Maine State Highway Commission. This bridge is considered to be one of his most important engineering achievements, and the bridge was later officially renamed to the Max L. Wilder Memorial Bridge.

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Photo details

  • Uploaded on November 26, 2012
  • Attribution-Noncommercial-No Derivative Works
    by BA Bartlett
    • Camera: SONY DSC-HX9V
    • Taken on 2012/11/25 07:46:03
    • Exposure: 0.033s (1/30)
    • Focal Length: 4.28mm
    • F/Stop: f/3.300
    • ISO Speed: ISO125
    • Exposure Bias: 0.00 EV
    • No flash