Lyman Viaduct

The bridge was added to the National Register of Historic Places in 1986 since it is capable of providing detailed information about construction methods of the period.

The structure consists of bents formed out of three quarter-round rolled wrought iron sections, with flanges designed to facilitate riveted assembly.

The entire structure is buried in earthen fill and topped by a dense pack of cinder blocks, now somewhat overgrown on the sides.

The trestle was one of the largest single capital expenses of the railroad venture, which was beset by cost overruns and failed after just ten years of operation.

Taken over by the NYNH&H, the trestle was filled as a comparatively inexpensive means of strengthening the structure for use by heavier equipment in the early 20th century.

The Air Line Trail on the filled trestle