The bridge is a very simple structure. It is built by placing large metal I-beams across the gap between the abutments. The gaps between the beams are filled in with plywood supported from the bottom, resulting in a flat smooth surface. Workers then poured a six-inch thick concrete deck over the beams. To finish off the ridge, steel railings are attached to the edge of deck. While this construction method is a little too light duty for a US-highway or Interstate highway, it is perfect for low traffic situations that supports very little truck traffic.
The St. Louis River is very interesting looking at this location. The riverbed is filled with large black rocks. The water flows between the rocks and is only rarely visible. The result is that the river looks like a large lava flow, much like what one might see in Hawaii or the desert southwest.
