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The Hoover Dam Bypass project was completed within budget at a cost of $240 million; the bridge portion cost $114 million. [4] The bridge was the first concrete-steel composite deck arch bridge built in the United States, [5] and incorporates the widest concrete arch in the Western Hemisphere.
The design is a steel deck arch bridge with pedestrian and bicycle lanes on both sides. Construction was funded with $136 million from the county (raised from a $17 annual vehicle registration fee), $33 million from the federal government, $35 million from the state, and $84.5 million from the city of Portland. [ 18 ]
The same structural effects are also true of the concrete slab in a composite girder bridge, but the steel orthotropic deck is considerably lighter, and therefore allows longer span bridges to be more efficiently designed. Resistance to use of an orthotropic deck relates mainly to its cost of fabrication, due to the amount of welding involved.
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The steel deck of the bridge, approximately 418,000 square feet (38,800 m 2), was paved with an epoxy asphalt concrete wearing surface in two layers. [33] The San Mateo Bridge was the first deployment of an epoxy asphalt concrete wearing surface. [34]
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