The Washington Avenue Bridge is a historic lenticular truss bridge carrying Washington Avenue over the Mad River in Waterbury, Connecticut.

[1] The Washington Avenue Bridge stands in a busy industrial and commercial area south of downtown Waterbury, carrying Washington Avenue over the Mad River just west of South Main Street.

The bridge is oriented east-west while the river flows from northeast to southwest, resulting in an offset of the trusses which historically supported its weight.

This bridge is the earliest known example of the company's distinctive lenticular trusses, and embodies construction materials and methods (wrought iron and pinned connections in particular) which went completely out of use by the end of the 19th century.

By that time, bridge designs had also largely been standardized, and lenticular trusses were no longer normally built.