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US-9 Ausable River Bridge

US-9 Ausable River Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: April 14, 2011

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Key Facts

Facility Carried / Feature Intersected
US-9 Over Ausable River
Rural: Clinton County, New York: United States
Construction Date and Builder / Engineer
1940 By Builder/Contractor: American Bridge Company of New York, New York and Engineer/Design: New York State Department of Public Works

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
255 Feet (77.7 Meters)
Structure Length
255 Feet (77.7 Meters)
Roadway Width
42 Feet (12.8 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)
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Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

View Historic Bridges of the AuSable River Valley National Register Multiple Property Submission

Overall, this bridge is an example of New York State's state standard plan for truss bridges, specifically the plan for a polygonal Warren truss bridge. Such bridges were built in large quantities throughout the state. Today, some examples are being maintained and preserved, while others are being demolished and replaced making this type an increasingly uncommon sight on the roads of New York State. This particularly example is lucky enough to be one of the examples that has been preserved.

This bridge is among the longest-spanning examples of New York's state polygonal Warren standard truss bridges with a 255 foot span. The bridge also has one of the widest decks with a 42 foot roadway. These two aspects of the bridge have resulted in a bridge with unusually massive members. In particular, the top chord, bottom chord, and end post have a very massive appearance. The bridge's unusual width provides this bridge with generous shoulders, which means that the typical complaints about preserving narrow historic truss bridges does not apply here.


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