Some covered bridges can stay to be a hundred years old. We chose the girder bridge because it isn t very complicated and it s very strong. It probably won t cost a lot of money and it will be safe if it is built properly. It s the simplest bride to build and the smallest. That s why we think the girder bridge is the best.
Girder bridges are very simple and strong.
There are three or four pillars holding up the deck, handrails and a ramp facing the library. The cantilever bridge is a beam bridge. Two arms strectch out in opposite directions from each pier. The first large cantilever bridge was built in Scotland in 1890. Our model bridge is 25 inches long and 3 inches tall.