The Old Corinth Road Bridge, commonly referred to as the Hadley Bow Bridge, was built by The Berlin Iron Bridge Co. in 1885 atop the foundations of an 1813 bridge. The Bow Bridge is unique in that it is the only remaining half-deck (roadway passes halfway between the lower and top chords), lenticular, wrought-iron, truss bridge of only two or three ever built. Because of this, it has been listed on the National Register and recorded by the Historic American Engineering Record.  

 The bridge fell into disrepair and was closed to vehicles in 1983. Through extraordinary efforts, the Hadley Bow Bridge was repaired and opened to traffic on 8/25/06. The reopening celebration marked the first time in 23 years that the two halves of Hadley were again linked by an operational bridge.
 

The Adirondack Railway reached Hadley in 1865. It merged with the Delaware & Hudson Railroad on Nov. 15, 1902.

The last freight train crossed the 518ft. Sacandaga River Trestle in 1989.