| 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 |
Ausable Chasm Bridge
|
 | US-9 Over Ausable River | Ausable Chasm: Clinton County, New York and Essex County, New York | Metal Three-Hinged Solid Ribbed Deck Arch, Fixed and Approach Spans: Concrete Deck Arch, Fixed |
Total Length: 411 ft Main Span Length: 126 ft Roadway Width: 30 ft Main Spans: 1 |
1934 By: Unknown | This steel arch bridge was designed to look attractive in its setting within the beautiful Ausable Chasm. | 
|
Keeseville Suspension Bridge
|
 | Pedestrian Walkway (Clinton Street) Over Ausable River | Keeseville: Clinton County, New York and Essex County, New York | Metal Pony Truss Stiffening Wire Cable Suspension, Fixed |
Main Span Length: 240 ft Main Spans: 1 |
1888 By: Berlin Iron Bridge Company of East Berlin, Connecticut | An unusual deviation from the usual type of bridge its builder built, this is also a rare example of an old and unaltered suspension foot bridge. | 
| X |
Lake Champlain Bridge
Crown Point Bridge |
| Bridge Road (VT-125, VT-17, and NY-903) Over Lake Champlain | Crown Point and Chimney Point: Essex County, New York and Addison County, Vermont | Metal Continuous (Arched) 14 Panel Rivet-Connected Polygonal Warren Through Truss, Fixed and Approach Spans: Metal Rivet-Connected Polygonal Warren Deck Truss, Fixed |
Total Length: 2184 ft Main Span Length: 434 ft Roadway Width: 26 ft Main Spans: 3 |
1929 By: American Bridge Company of New York, New York and Fay, Spofford, and Thorndike of Boston, Massachusetts | A nationally significant and early example of a rare arch-shaped cantilever truss, this bridge was located in an area rich with history. | 
|
Main Street Bridge
|
| Main Street (NY-22) Over Ausable River | Keeseville: Clinton County, New York and Essex County, New York | Stone Segmental Deck Arch, Fixed |
Total Length: 109 ft Main Span Length: 91 ft Roadway Width: 22.3 ft Main Spans: 1 |
1842 By: Unknown | With two colors of stone, this is a very old arch bridge with a relatively long span length as well. | 
|
Old State Road Bridge
|
 | Old State Road Over Ausable River | Ausable Chasm: Clinton County, New York and Essex County, New York | Metal Continuous 6 Panel Pin-Connected Pratt Full-Slope Pony Truss, Fixed |
Total Length: 136 ft Main Span Length: 69 ft Roadway Width: 15 ft Main Spans: 2 |
By: Unknown | This rare continuous pin-connected pony truss sits in an exctremely beautiful setting with its pier built into natural rock next to a waterfall. | 
|
Upper Bridge
|
| Liberty Street (River Street) Over Ausable River | Keeseville: Clinton County, New York and Essex County, New York | Metal 8 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 218 ft Main Span Length: 108 ft Roadway Width: 15.3 ft Main Spans: 2 |
1878 By: Murray Dougal and Company of Milton, Pennsylvania | This is a very old surviving Pratt truss bridge and it has ornate cast iron portal bracing. | 
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