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22 1/2 Mile Road Bridge

22 1/2 Mile Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: Spring 2007

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Key Facts

Facility Carried / Feature Intersected
22 1/2 Mile Road Over St. Joseph River
Rural: Calhoun County, Michigan: United States
Construction Date and Builder / Engineer
1906 By Builder/Contractor: Elkhart Bridge and Iron Company of Elkhart, Indiana

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
89 Feet (27.1 Meters)
Structure Length
90 Feet (27.4 Meters)
Roadway Width
15 Feet (4.57 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

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

This bridge is historically significant as the last remaining truss bridge in Michigan that has been associated with the Elkhart Bridge and Iron Company.

Most through truss bridges that have this general appearance, with a traditional trapezoidal design and fairly lightweight members, have pinned connections, but this bridge has riveted connections instead. Compare this bridge to the late Church Road Bridge, which was a similar structure. The 22 1/2 Mile Road Bridge is unusual because it lacks v-lacing on its vertical members. V-lacing is present under the top chord of this bridge however. This bridge is six panels in length, and sits on concrete abutments. The deck of the bridge is wood. The portal bracing is the a-frame design. Original lattice guardrails remain on this bridge. This bridge was listed with a 1906 construction date, which seems on-target for this design. In 2007, the bridge remained open to traffic with a 10 ton weight limit posted. An attractive blue paint is present on the bridge, but this bridge needs a fresh coat badly. The lower chord connections on this bridge are badly rusted. In fact, this bridge needs a total restoration. It would be great to see Calhoun County step forward and restore this bridge so it continue to carry 22 1/2 Mile Road's light vehicular traffic in its attractive wooded setting. By 2011, this bridge had been closed to all traffic. The future of this bridge is uncertain. Will the county that created the first historic bridge park in the country continue to lead the way in historic preservation by restoring this bridge? This bridge could economically be rehabilitated for continued light vehicular use in this rural location, likely for less than the cost of replacement. Michigan's Local Bridge Program provides funds for rehabilitation.

Information and Findings From Michigan Historic Bridge Inventory

MDOT Historic Bridge 22.5 Mile Rd. / St. Joseph River

Narrative Description

This bridge was built by the Elkhart Bridge and Iron Company of Elkhart, Indiana, one of many medium-sized metal truss bridge companies in the Midwest during the late nineteenth and early twentieth centuries.

This bridge is tagged with the following special condition(s): Available


Photo Galleries and Videos: 22 1/2 Mile Road Bridge

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Structure Details
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A collection of detail photos that document the parts, construction, and condition of the bridge. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer


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