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| Key Facts |
| Bridge Name | Facility Carried / Feature Intersected | Location | Structure Type | Construction Date and Builder/Engineer | |
|---|---|---|---|---|---|
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305th Avenue Bridge
Iowa Bridge Number 347140 | 305th Avenue Over Bohemian Creek | Rural: Winneshiek County, Iowa | Metal 8 Panel Rivet-Connected Warren Pony Truss, Fixed | 1922 By Builder/Contractor: Unknown |
| Technical Facts |
| Main Span Length | Structure Length | Roadway Width | Main Spans | NBI Number |
| 70 Feet (21.3 Meters) | 75 Feet (22.9 Meters) | 16.1 Feet (4.9 Meters) | 1 | 347140 |
This bridge is a traditionally composed riveted truss
bridge in Iowa. It conforms to a standard plan and a number of bridges
similar in design to this one remain in Iowa, although the exact size and
configuration varies from bridge to bridge making each bridge unique in some
way.
At the very least, the best representative examples of standard
plan truss bridges such as this one should be highlighted for preservation
to retain a record of this period in history. Longer spans, multi-span
examples, and unaltered examples should receive preservation priority.
In reality however, the majority of these bridges are fully capable of
being rehabilitated for continued rural vehicular use and there is no reason
to even consider the demolition of these bridges whether highly noteworthy
or not. Many of Iowa's truss bridges are on rural dirt roads that have not
been exposed to the extremely corrosive de-icing salt that bridges in other
states have suffered from. As a result, they retain a comparatively high
degree of structural integrity due to a striking lack of pack rust and
section loss. In addition, these bridges were built with a higher quality of
materials and construction than any modern bridge (contrary to what AASHTO
would have you believe). These truss bridges are much more beautiful than
any modern bridge. They contribute to the Iowa landscape in a positive
manner and are an asset to the state.
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