The Purdy Bridge is a continuous hollow-box girder

Girder

A girder is a support beam used in construction. Girders often have an I-beam cross section for strength, but may also have a box shape, Z shape or other forms. Girder is the term used to denote the main horizontal support of a structure which supports smaller beams...

 bridge that spans 550 feet (167.6 m) (with a central span of 190 feet (57.9 m)) over Henderson Bay, connecting Purdy, Washington

Purdy, Washington

Purdy is a small unincorporated community north of the city of Gig Harbor, on the northern boundary of Pierce County, Washington. It is located on the shores of Burley Lagoon and Henderson Bay of the Carr Inlet...

, USA with the Purdy Sand Spit Park. It was built on September 29, 1937, and at the time was the longest continuous box girder bridge in the US, at a cost of $62,000 from a design by Homer M. Hadley. At the time it was built, Purdy Bridge was the first bridge in the United States to utilize a reinforced-concrete box girder design.

The bridge was added to the National Register of Historic Places

National Register of Historic Places

The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

in 1982.

Sources

• Holstine, Craig; Hobbs, Richard (2005). Spanning Washington: Historic Highway Bridges of the Evergreen State, Washington State University Press, ISBN 0874222818.
• Slater, Colleen A. (2007). The Key Peninsula, Arcadia Publishing.