Steamboat Slough Bridge (24 0052) is a two-lane, double-leaf Strauss Heel Trunnion Bascule bridge, the most important patented bascule bridge design. It has three spans and rests on two concrete piers located about 20 feet from each abutment. Large concrete counterweights are mounted in the steel frame over the roadway at each abutment; the gear houses are suspended above the deck by the counterweights. The cantilevered operator's control house at the west end of the bridge is attached to the side of the bridge at roadway level. As part of the original construction there were two concrete and steel light standards flanking both entrances to the bridge. These have been removed, but the concrete pedestals with bronze dedication plaques mounted on them are still at the original locations. The bridge has latticework metal railings, a steel grate deck and wooden wheel blocks. In 2007, the cantilevered operator's control house was replaced by a new and compatible cantilevered control house.