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Tiffany Bridge

Smith Road Bridge

Tiffany Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: June 30, 2009

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Key Facts

Facility Carried / Feature Intersected
Smith Road Over Turtle Creek
Tiffany: Rock County, Wisconsin: United States
Construction Date and Builder / Engineer
1910 By Builder/Contractor: Worden-Allen Company of Milwaukee, Wisconsin

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
120 Feet (36.58 Meters)
Structure Length
122 Feet (37.19 Meters)
Roadway Width
14.8 Feet (4.51 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)

Bridge Documentation

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.


Photos and Videos: Tiffany Bridge

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