a semicircular structure with abutments on each end
an arch bridge is a bridge supported by a concrete or steel arch underneath the bridge that directs pressure and weight of the bridge outward to the supports along the arch. Sponsored By
A bridge whose main support structure is an arch, such as the Fremont. Additionally, the bridge may be termed a through arch, which is simply one where the roadway appears to go through the arch (again the Fremont is a good example of this).
An arch bridge (sometimes deck arch bridge to distinguish it from a through arch bridge) is a bridge with abutments at each end 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. A viaduct (a long bridge) may be made from a series of arches, although other more economical structures are typically used today.