The photo shows another situation where a support was required over a river channel. Therefore, a small bridge was built over the channel to support the column. We can see the railroad tracks in the foreground that prevented the designer from placing the column beyond the channel. Bridges are built to carry people and goods over obstacles. Sometimes the bridge's supports also need bridges when there are a variety of obstacles to be avoided.
California Bridges - The Distribution Structure by Mark Yashinsky is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.