Located in Woodstock, this highly significant stone arch bridge crosses South Street.
Originally built in 1867, the bridge is a highly rare example of a helicoidal stone arch. A helicoidal stone arch has a twist in it, and is considerably more difficult to construct than a regular stone arch.
A second track was added in 1897, by simply combining with the original span.
Apart from the age, the helicoidal design is among the rarest types of bridges in the United States. Also known as a spiral arch, only nine are known to exist in the US. Two exist in Illinois.
The age is also cause for significance. An 1860s bridge is a feat, especially when considering the arch design.
Overall, the bridge appears to be in good condition.
The author has ranked this bridge as being nationally significant, due to the unique design and exceptionally old age.
The photo above is a view of the west (1897) face.