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| Key Facts |
| Bridge Name | Facility Carried / Feature Intersected | Location | Structure Type | Construction Date and Builder/Engineer | |
|---|---|---|---|---|---|
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220th Street Bridge
Iowa Bridge Number 342800 | 220th Street Over Railroad (Union Pacific) | Rural: Webster County, Iowa | Metal 6 Panel Rivet-Connected Howe Pony Truss, Fixed | By Builder/Contractor: Unknown |
| Technical Facts |
| Main Span Length | Structure Length | Roadway Width | Main Spans | NBI Number |
| 76 Feet (23.2 Meters) | 78 Feet (23.8 Meters) | 21 Feet (6.4 Meters) | 1 | 342800 |
Often, when a highway crosses a railroad, the railroad company was still responsible for the design and construction of a bridge to form a grade separation, as opposed to having the road owner design and construct the bridge. Such bridges tend to display unusual design features because as highway bridges they are often lighter weight bridges than bridges built to carry trains, while still displaying a railroad company thinking in terms of bridge design. Surviving examples tend to be significant and worthy of preservation, and the 220th Street Bridge is no exception. The unusual bridge follows a Howe truss configuration whose counter members make it also look like a double-intersection Warren. The description of the bridge as a Howe as opposed to a Double-Warren is made on the basis that the upward-center facing diagonals are much more substantial than their counters. The bridge is an example of a rare truss type, and an example of a railroad-designed highway bridge.
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