Why is it needed? Project Phases The New Bridge and Interchange The Detour Bridge Sustainability Diversity Program Field Work and Construction Updates Contractor Information
Past Events and Activities Past Committee Meetings School-Based Outreach Program
Library Newsroom Photo and Image Gallery EIS Documents Links Frequently Asked Questions
Overview Before the Bridge Bridge Fever! The Great Bridge Scandal Gustav Lindenthal Construction and Dedication Need for Replacement River View Cemetery

What is a Steel Deck Arch?

Example Deck Arch Bridges

Vista Bridge, Portland

Vista Bridge (Portland)

Cape Creek Bridge

Cape Creek Bridge (Lane County, Oregon)

Harlem River Bridges

Harlem River Bridges (New York)

An arch bridge is a bridge with abutments (supports at each end of the bridge superstructure) that are shaped as a curved arch. Arch bridges work by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side. In the case of a deck arch, the deck, or roadway, rests on top of the supporting arches, which in turn are supported by the abutments and piers in the water.

The area between the arches and the deck is known as the spandrel. If the spandrel is solid, usually the case in older masonry or stone arch bridges, it is called a closed-spandrel arch bridge. If the deck is supported by a number of vertical columns rising from the arch, typical in newer bridges, it is known as an open-spandrel arch bridge. For a steel deck arch bridge, the arches and spandrels are made of steel. The abutments, piers and deck are usually made of concrete.