Photo Credit: Alex Mead
Seen above is a swing bridge over a small river near Detroit, MI. The concept of a swing bridge is similar to a draw bridge in that the bridge is movable to allow traffic to pass through the area it spans. This allows a smaller bridge to be built than would otherwise be necessary for height clearance purposes. The swing bridge operates by rotating around the central pivot of the span to clear the area above the water surface to allow vessels to pass. The bridge is currently in the “closed” position and would be perpendicular to the screen if it were rotated to the “open” position to allow traffic to pass.