The first point to note is the fabricator of this bridge: The Vermont Construction Company of St. Albans, VT. This bridge is one of only 3 remaining examples from this small company, and is the oldest of them. Many more examples of bridges were fabricated by this company in the last 2 decades of the 19th century, but they never commanded a large market share during their time, making them uncommon even while in production.
The second point would be the construction method: This is a riveted truss bridge, making it among the older examples of a bridge that employed this construction method. While not the oldest, it is still very significant as a early example, and reflects the innovative nature of the Vermont Construction Company.
Of note, although not as significant, are some of the details of the bridge. The upper chord (except for the endposts) are open built up box members, with the top being comprised of x lacing, and the bottom being battens built into the box member (as opposed to resting outside of it). The vertical compression members are tapered web posts, as opposed to a more common parallel configuration.
The bridge underwent an extensive reconstruction in 2010. The lower chord and floorbeams received the most amount of work, with a significant amount of the original rivets being replaced with bolts. However the trusses themselves had no rivet replacement, meaning that the easily visible part of the bridge retains an exceptional amount of historical integrity.