| Special Bridge Conditions Legend |
| ! | Confirmed demolition date within one year or an especially historic bridge that is threatened with demolition at any level. |
| X | The bridge has been confirmed demolished or collapsed. |
| S | The bridge has been dismantled or moved to an offsite location and is not currently available for public viewing. |
| L | Most or all of the original bridge material has been demolished and replaced, including historically significant elements, but some original parts of the bridge remain. |
| Note: This website cannot guarantee the current condition of any bridge on this website. Bridges lacking these icons should not necessarily be considered condition-free. |
| Bridge Name | HSR Rating | Facility Carried / Feature Intersected | Location | Structure Type | Structure Dimensions | Construction Date / Builder or Contractor | Description | Thumbnail |
30th Street Bridge
Iowa Bridge Number 183540 |
 | 30th Street Over Bigalks Creek (Nichols Creek) | Rural: Howard County, Iowa | Metal 5 Panel Rivet-Connected Pratt Full-Slope Pony Truss, Fixed |
Total Length: 43 ft Main Span Length: 40 ft Roadway Width: 17.7 ft Main Spans: 1 |
1925 By: Unknown | A small riveted truss bridge adds beauty to the roadway it serves. | 
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