Bridge! Today

The ends of a bridge are supported by Abutments , which act as retaining walls, while horizontal girders span the distance between piers to carry the traffic surface.

You can even own a piece of history, such as original steel grating from the Mackinac Bridge, which measures about 5 inches deep. 3. Fitness: The "Deep" Rainbow Bridge Bridge!

Large bridges rely on piles —long shafts of concrete, timber, or steel—driven hundreds of feet into the ground to reach stable soil. The ends of a bridge are supported by

Ask yourself, "What is the moral of this story?" or "What happens now that I know what I know?" to find the heart of the message. 2. Engineering: Supporting Massive Loads which act as retaining walls