| 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 |
Bear Creek Bridge
Knox Road Bridge |
 | Knox Road (TR-347, Donley Road, Jackson Avenue) Over South Branch Bear Creek | Rural: Armstrong County, Pennsylvania and Butler County, Pennsylvania | Metal 8 Panel Rivet-Connected Warren Pony Truss, Fixed |
Total Length: 83 ft Main Span Length: 77 ft Roadway Width: 17.7 ft Main Spans: 1 |
1913 By: Farris Bridge Company of Pittsburgh, Pennsylvania | A beautiful Warren pony truss in a hilly forest setting. | 
|
Book Bridge
|
 | Book Road Over Muddy Creek | Rural: Butler County, Pennsylvania | Metal 4 Panel Pin-Connected Pratt Pony Truss, Fixed |
Total Length: 56 ft Main Span Length: 51.8 ft Roadway Width: 15.4 ft Main Spans: 1 |
By: Pittsburgh Bridge Company of Pittsburgh, Pennsylvania | This bridge stands out as an old, unaltered bridge with a couple rare details. | 
| X |
Caldwell Bridge
Hoon Road Bridge |
 | Hoon Road Over Connoquenessing Creek | Rural: Butler County, Pennsylvania | Metal 4 Panel Rivet-Connected Pratt Half-Hip Pony Truss, Fixed |
Total Length: 61 ft Main Span Length: 56 ft Roadway Width: 14.8 ft Main Spans: 1 |
1902 By: Unknown | Representing the transition from pinned to riveted connections, this extremely early example of a riveted Pratt pony truss was demolished! | 
| X |
Currie Road Bridge
|
| Currie Road (TR-318) Over Muddy Creek | Rural: Butler County, Pennsylvania | Concrete Closed Spandrel Deck Arch, Fixed |
Total Length: 34 ft Main Span Length: 30 ft Roadway Width: 13.8 ft Main Spans: 1 |
1909 By: Unknown | With its unusually large railings, this is a very old and unaltered example of a concrete arch in Pennsylvania. | 
| X |
Doughertys Mills Bridge
|
 | Centreville Pike (PA-173) Over Slippery Rock Creek | Doughertys Mills: Butler County, Pennsylvania | Concrete Closed Spandrel Deck Arch, Fixed |
Total Length: 140 ft Main Span Length: 70 ft Roadway Width: 27.6 ft Main Spans: 2 |
1929 By: Woods and Golden and Pennsylvania State Highway Department | Even without original railings, this bridge still was an attractive part of a scenic location adjacent to a park. | 
|
Jefferson Street Bridge
Karns Crossing Bridge |
 | Jefferson Street (PA-68) Over Buffalo and Pittsburgh Railroad Yard and Connoquenessing Creek | Butler: Butler County, Pennsylvania | Metal 6 Panel Rivet-Connected Pratt Through Truss, Fixed |
Total Length: 868.2 ft Main Span Length: 168 ft Roadway Width: 33.8 ft Main Spans: 2 |
1937 By: Unknown and Pennsylvania State Highway Department | This massive-membered truss bridge is unique because its two main spans are separate from each other. | 
|
Mercer Street Extension Bridge
|
| Mercer Street Extension (Private Section) Over Connoquenessing Creek | Harmony: Butler County, Pennsylvania | Metal 8 Panel Rivet-Connected Pratt Half-Hip Pony Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed | Main Spans: 1 | By: Unknown | This beautiful riveted through truss bridge in a county with few truss bridges is unfortunately fenced off and privately owned. | 
| X |
Senn Bridge
|
| Evergreen Mill Road (TR-323) Over Little Connoquenessing Creek | Rural: Butler County, Pennsylvania | Metal 6 Panel Multiple-Type-Connected Polygonal Warren Pony Truss, Fixed |
Total Length: 91 ft Main Span Length: 86 ft Roadway Width: 19.7 ft Main Spans: 1 |
1929 By: Victor C. Minteer of New Wilmington, Pennsylvania and Farris Engineering Company of Pittsburgh, Pennsylvania | This extremely unusual bridge is technologically significant for its pin-connected bottom chord with all other connections riveted. | 
|
Wassum Bridge
|
| Watson Road (TR-439) Over North Branch Slippery Rock Creek | Rural: Butler County, Pennsylvania | Metal 3 Panel Rivet-Connected Pratt Half-Hip Pony Truss, Fixed |
Total Length: 38 ft Main Span Length: 36.1 ft Roadway Width: 15.7 ft Main Spans: 1 |
By: Penn Bridge Company of Beaver Falls, Pennsylvania | A small example of a riveted half hip pony truss, in a county with relatively few remaining truss bridges. | 
| X |
Wayne Street Viaduct
|
| Wayne Street (PA-356) Over Railroad (B and LE RR, B and P RR), Connoquenessing Creek, Cliff Street | Butler: Butler County, Pennsylvania | Metal Deck Girder, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed |
Total Length: 865.2 ft Main Span Length: 84 ft Roadway Width: 35.8 ft Main Spans: 12 |
1915 By: Fort Pitt Bridge Works of Pittsburgh, Pennsylvania and Waddell and Harrington | A very long plate girder viaduct with attractive v-laced supports was demolished. | 
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