| 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 |
110th Street Bridge
Iowa Bridge Number 78120 |
 | 110th Street (U Avenue) Over Squaw Creek | Rural: Boone County, Iowa | Concrete Marsh Rainbow Through Arch, Fixed |
Total Length: 88 ft Main Span Length: 60 ft Roadway Width: 17.1 ft Main Spans: 1 |
1918 By: Marsh Engineering Company of Des Moines, Iowa | A beautiful and well-preserved example of a rare and significant Marsh rainbow arch bridge. | 
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L Avenue Bridge
Iowa Bridge Number 77840 |
 | L Avenue Over Railroad (Union Pacific) | Rural: Boone County, Iowa | Metal Rivet-Connected Double-Intersection Warren Pony Truss, Fixed and Approach Spans: Wood Stringer (Multi-Beam), Fixed |
Total Length: 130 ft Main Span Length: 47 ft Roadway Width: 17.7 ft Main Spans: 1 |
By: Unknown | A noteworthy example of a railroad-designed highway over railroad truss bridge. | 
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Wagon Wheel Bridge
Iowa Bridge Number 77850 |
 | 200th Street Over Des Moines River | Rural: Boone County, Iowa | Metal 12 Panel Pin-Connected Pennsylvania Through Truss, Fixed and Approach Spans: Wood Stringer (Multi-Beam), Fixed |
Total Length: 703 ft Main Span Length: 200 ft Roadway Width: 16 ft Main Spans: 4 |
1911 By: Iowa Bridge Company of Des Moines, Iowa | This unique bridge is an extremely rare bridge that contains a variety of pin-connected through truss span designs. | 
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