This bridge appears to be one of Michigan's most important metal stringer bridges, although the historic bridge inventory apparently did not recognize its significance. This appears to be one of the oldest examples of a bridge with original R4 railings in the state, and is also an example of a bridge which was either a transitional bridge or a prototype bridge as the state highway department moved from one standard plan to a new standard plan for stringer bridges. The old plan included stringers with a unique concrete balustrade design and a concrete facade over the outermost stringer to give the bridge an overall appearance of a concrete bridge when it was in face a steel stringer. This plan was abandoned for the new plan which did not include the concrete facade on any beams, and began the use of R4 railings. Most of the other earliest instances of bridges with original R4 railings on them are dated to around 1935, while the last of the concrete facade and balustrade stringers date to 1932 or earlier. The 108th Avenue Bridge, with a construction date of 1932, features the R4 railings, but also features the general pier design and concrete facade seen in the concrete balustrade plan bridges of the late 1920s and early 1930s. The R4 railings on 108th Avenue were determined to be original (and not a later alteration/addition) because the inset design on their concrete railing is the oldest design. If the railings were not original they would have more than likely featured the more common keyhole design on the concrete railing posts. In addition no alteration to the bridge is recorded or was observed during on-site inspection.
R4 railings are the decorative railings that would give the gift of beauty to Michigan stringer bridges until the 1960s. For roughly 30 years, Michigan used these railing panels, fitted between railing post designs that varied over time and from bridge to bridge between a few different styles. The R4 railing has defined much of Michigan's 20th century historic bridges.
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This historic bridge has been demolished. This map is shown for reference purposes only.
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