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Tiffany Bridge

Smith Road Bridge

   
                  


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Bridge Documented: June 30, 2009
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Key Facts
Bridge Name Facility Carried / Feature Intersected Location Structure Type Construction Date and Builder/Engineer
Tiffany Bridge
Smith Road Bridge
Smith Road Over Turtle Creek Tiffany: Rock County, Wisconsin Metal 8 Panel Bolt-Connected Pratt Through Truss, Fixed 1910 By Builder/Contractor: Worden-Allen Company of Milwaukee, Wisconsin
Technical Facts
Main Span Length Structure Length Roadway Width Main Spans NBI Number
120 Feet (36.6 Meters) 122 Feet (37.2 Meters) 14.8 Feet (4.5 Meters) 1 P53015300000000

Historic Significance Rating (HSR)

Primary Photographer(s): Nathan Holth and Rick McOmber

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This 1910 bridge is an extremely unusual and early example of the truss bridge using bolted connections for all connection points. Its design is very similar to an average truss bridge from the period with riveted connection, except that there are bolts holding the members to the gusset plates.

During the late 1800s, pinned connections were the most common form of connection used on truss bridges because field riveting equipment and skilled labor was not available to erect the bridges on-site using riveted connections. Bolts were used sparingly, generally only to assemble segmented  pieces of the larger shop riveted beams together, such as the top chord. As the 20th Century rolled around and field riveting became available, then riveted connections became common, and rivets were used for mostly everything until the 1960s. As such, bolted connections did not become overly popular until the 1970s.

This bridge is otherwise traditionally composed for a 1910 bridge, with built-up beams composing the truss web and an a-frame portal bracing. The bridge has been altered with the addition of welded plates to portions of the truss. In addition, some of the original bolts (having square-shaped nuts) have been replaced with modern high-strength bolts (having hexagonal bolts). These alterations have diminished the historic integrity of the bridge, however because of this bridge's bolted connections, the bridge remains significant.

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Photos and Videos: Tiffany Bridge

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