Hampden County Memorial Bridge, Spanning Connecticut River on Memorial Drive, Springfield, Hampden County, MA
Significance: The Hampden County Memorial Bridge's main span is the longest concrete deck arch span in Massachusetts. The bridge is a finely-engineered example of a rare self-supporting arch rib reinforcement technique, derived from the Melan tradition. Once encased in concrete, the steel arch reinforcing truss acts as a partner with the concrete in bearing the dead load of the structure. Although the deck is supported on spandrel columns, they are concealed behind a fascia spandrel wall, conveying the impression of a solid structure. The consulting architects, Haven & Hoyt, embellished the structure with artificial stone, notably in the four pylons of the main channel span.
Survey number: HAER MA-114
Building/structure dates: 1922 Initial Construction