| 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 |
Fox River Aqueduct
|
 | Illinois and Michigan Canal (Abandoned Dry Section) Over Fox River | Ottawa: La Salle County, Illinois | Metal Through Girder, Fixed | Main Spans: 8 | By: Unknown | Although it no longer carries water, this is an impressive and large example of a metal aqueduct. | 
| X |
Seneca Bridge
|
 | IL-170 (29th Road) Over Illinois River | Seneca: La Salle County, Illinois | Metal 14 Panel Rivet-Connected Pennsylvania Through Truss, Fixed |
Total Length: 1510 ft Main Span Length: 364 ft Roadway Width: 23 ft Main Spans: 4 |
1932 By: Wisconsin Bridge and Iron Company of Milwaukee, Wisconsin | This spectacular historic bridge was replaced by one of the ugliest bridges imaginable. | 
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