This cache may be a bit more difficult than some others. It requires some physical dexterity, possibly some contortions, and it's best if you don't have a fear of heights.
The coordinates take you to roughly the middle of the bridge. From there, you'll have to use your geo-powers in order to figure this one out. The name itself is one of the hints. Only use the real hint if you have to.
The cache is relatively small - there is room for some small trade items but there is no pen or pencil so BYOP.