| 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 | ! |
Canal Road Bridge
Kelly Road Bridge |
 | Canal Road (TR-388, Canal Road) Over Shenango River | Sharpsville: Mercer County, Pennsylvania | Metal 11 Panel Pin-Connected Camelback Through Truss, Fixed |
Total Length: 187 ft Main Span Length: 179 ft Roadway Width: 16 ft Main Spans: 1 |
1897 By: Penn Bridge Company of Beaver Falls, Pennsylvania | This beautiful and rare treasure is near a park on a lightly traveled road, yet is in danger of demolition! | 
| ! |
Carlton Bridge
|
 | New Lebanon Road (PA-1015) Over French Creek | Carlton: Mercer County, Pennsylvania | Metal 9 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 276 ft Main Span Length: 137 ft Roadway Width: 16.4 ft Main Spans: 2 |
1898 By: Columbia Bridge Works of Dayton, Ohio | A stunning Columbia Bridge Works of Dayton, Ohio bridge, showcasing some of their unique, unusual design ideas. | 
|
Clarks Mills Bridge
|
 | Mill Road (TR-740) Over Little Shenango River | Clarks Mills (Rural): Mercer County, Pennsylvania | Metal 5 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 82 ft Main Span Length: 78 ft Roadway Width: 12.1 ft Main Spans: 1 |
1885 By: Penn Bridge Company of Beaver Falls, Pennsylvania | A very old Penn Bridge Company of Beaver Falls, Pennsylvania Bridge with remarkable historic integrity! | 
|
Cool Spring Creek Bridge
|
| Private Drive (Former US-62 Alignment) Over Cool Spring Creek | Rural: Mercer County, Pennsylvania | Concrete Curved Chord Through Girder, Fixed | Main Spans: 1 | By: Unknown | One of two similar bridges in the county that are only known remaining examples of their kind in Pennsylvania. | 
|
Hope Mills Bridge
Old Mercer Road Bridge |
 | Old Mercer Road (TR-401) Over Neshannock Creek | Rural: Mercer County, Pennsylvania | Metal 6 Panel Rivet-Connected Pratt Through Truss, Fixed |
Total Length: 104 ft Main Span Length: 102 ft Roadway Width: 17 ft Main Spans: 1 |
1922 By: Unknown | A semi-massive member bridge tucked away in a scenic wooded environment. | 
|
Irishtown Road Bridge
|
 | Irishtown Road (PA-2005) Over Railroad (Bessemer and Lake Erie) | Rural: Mercer County, Pennsylvania | Metal Through Girder, Fixed and Approach Spans: Concrete T-Beam, Fixed |
Total Length: 162 ft Main Span Length: 64 ft Roadway Width: 24.3 ft Main Spans: 1 |
1928 By: Unknown | This bridge is an interesting example of a bridge that has both t-beam and girder spans with integrity. | 
|
Leesburg Station Road Bridge
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| Leesburg Station Road (PA-2002) Over Neshannock Creek | Rural: Mercer County, Pennsylvania | Metal Rivet-Connected Warren Pony Truss, Fixed |
Total Length: 95 ft Main Span Length: 92 ft Roadway Width: 11.8 ft Main Spans: 1 |
1927 By: Unknown | An extremely narrow and uncommon massive-member Warren pony truss. | 
| X |
Milburn Road Bridge
|
 | Milburn Road (PA-2004) Over Neshannock Creek | Rural: Mercer County, Pennsylvania | Metal 5 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 80 ft Main Span Length: 80 ft Roadway Width: 12 ft Main Spans: 1 |
1880 By: Wrought Iron Bridge Company of Canton, Ohio | A small through truss built by the Wrought Iron Bridge Company of Canton, Ohio was sentenced to the dumpster. | 
|
Munnell Run Private Bridge
|
 | Private Drive Over Munnell Run | Mercer: Mercer County, Pennsylvania | Metal 4 Panel Rivet-Connected Double-Intersection Warren Pony Truss, Fixed | Main Spans: 1 | By: Sharpsville Steam Boiler Works of Sharpsville, Pennsylvania | This is a small yet attractive and unusual little pony truss. | 
| ! |
Ohl Street Bridge
|
| Ohl Street Over Shenango River | Greenville: Mercer County, Pennsylvania | Metal 6 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 256 ft Main Span Length: 126 ft Roadway Width: 29 ft Main Spans: 2 |
1909 By: Canton Bridge Company of Canton, Ohio | This ornate two-span bridge is also noted for its width and location in a potential historic district. | 
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Old Jackson Center Bridge
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| US-62 (Abandoned Alignment) Over Yellow Creek | Jackson Center: Mercer County, Pennsylvania | Concrete Curved Chord Through Girder, Fixed | Main Spans: 1 | By: Unknown | This bridge appears to be based off of of unique bridge type designed in Michigan. | 
| ! |
Perry Highway Bridge
Iron Bridge |
| Perry Highway (US-19) Over Neshannock Creek | Rural: Mercer County, Pennsylvania | Metal 8 Panel Rivet-Connected Pratt Through Truss, Fixed |
Total Length: 133 ft Main Span Length: 128 ft Roadway Width: 23 ft Main Spans: 1 |
1928 By: Unknown | This bridge was significantly altered when its sway bracing was changed and moved outside of the bridge. | 
|
Quaker Bridge
Williamson's Crossing Bridge |
| Williamson Road (PA-4006) (Abandoned Alignment) Over Little Shenango River | Rural (Near Greenville): Mercer County, Pennsylvania | Metal 8 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 126 ft Main Span Length: 124 ft Roadway Width: 14 ft Main Spans: 1 |
By: Unknown | This beautiful historic bridge is the first rural western Pennsylvania truss bridge to be preserved! | 
| ! |
Sharon NS/CSX Railroad Bridge
|
| Railroad (Norfolk Southern and CSX) Over Shenango River | Sharon: Mercer County, Pennsylvania | Metal Rivet-Connected Lattice (Quadruple Warren) Through Truss, Fixed | Main Spans: 2 | By: Unknown | A rare example of an unusual, and visually complex and stunning truss configuration. | 
|
Sharon NYC Railroad Bridge
|
| Railroad (Abandoned New York Central) Over Shenango River | Sharon: Mercer County, Pennsylvania | Metal 10 Panel Pin-Connected Pratt Through Truss, Fixed | Main Spans: 2 | By: Unknown | This is an old two-span railroad truss bridge noted for its skew and its pinned connections. | 
| X |
Shenango River Railroad Bridge
Erie Railroad Bridge |
| Railroad (Norfolk Southern) Over Shenango River | Rural: Mercer County, Pennsylvania | Metal 8 Panel Rivet-Connected Lattice (Quadruple Warren) Through Truss, Fixed |
Total Length: 264 ft Main Span Length: 135.4 ft Roadway Width: 18 ft Main Spans: 2 |
1895 By: Unknown | This was a rare example of multi-span lattice truss bridge with two spans each of a different age. | 
|
Stamm Road Bridge
|
 | Stamm Road Over Lawango Run | New Hamburg: Mercer County, Pennsylvania | Metal Pin-Connected Half-Hip Pony Truss, Fixed | Main Spans: 1 | By: Unknown | This abandoned bridge is noted for its decorative railings and skew. | 
|
Wasser Road Bridge
|
 | Wasser Road (PA-4003) Over Shenango River | Rural: Mercer County, Pennsylvania | Metal Through Girder, Fixed |
Total Length: 182 ft Main Span Length: 89 ft Roadway Width: 17.4 ft Main Spans: 2 |
1914 By: Unknown | This bridge is a concrete encased plate girder that had its encasement removed. | 
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West Middlesex Viaduct
|
| Main Street (Hubbard Road, PA-318) Over Shenango River, Garfield Street, Abandoned Railroad | West Middlesex: Mercer County, Pennsylvania | Metal 11 Panel Rivet-Connected Pratt Deck Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed |
Total Length: 718 ft Main Span Length: 202 ft Roadway Width: 26.2 ft Main Spans: 1 |
1941 By: Bethlehem Steel Company of Bethlehem, Pennsylvania and Pennsylvania State Highway Department | The only example of a highway deck truss in Mercer County. | 
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