Photograph of construction of a large arch in 4th Street Viaduct, [s.d.]. In the foreground at center, a small plant with red flowers can be seen. Behind the plant, a large pile of yellow-shaded dirt sits beside additional green vegetation. Further in the background, piles of logs can be seen. In the extreme background at center, a large arch can be seen extending from left to right. a series of metal cross beams sit beneath the arch for support. At least three ladders lean against the structure, and a group of men stand beside the base of the center ladder. A small crane can also be seen near the center ladder. At the top of the arch, a group of at least three men are also visible.