|Bridge Name||Facility Carried / Feature Intersected||Location||Structure Type||Construction Date and Builder/Engineer|
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|
|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
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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