Boulder_Creek_Bridge_(Boulder,_Colorado)
Boulder Creek Bridge (Boulder, Colorado)
United States historic place
The Boulder Creek Bridge near Boulder, Colorado is a concrete slab and girder bridge which was built in 1953. It was listed on the National Register of Historic Places in 2003.[1]
It brings Colorado State Highway 119 over Boulder Creek, and was under Federal rather than state management as the highway provides access from Boulder to the Roosevelt National Forest.[2]
It was designed by the U.S. Bureau of Public Roads.[3] It is 100 feet (30 m) in total length, and 39 feet (12 m) wide carrying a 34 feet (10 m)-wide roadbed. It consists of three spans, the main one being 48 feet (15 m) long. It has concrete abutments, wingwalls, and spill-through piers. Steel flex beams on the approach were a later addition.[2]
It was deemed technologically significant as one of the first concrete girder bridges in Colorado of a new type, having parabolically arched beams rather than flat ones, and supported by concrete spill through piers.[2]