Bridge four-lane highway on the upper level and a pair of railway tracks at the lower level. Tower Bridge in London is different example of a double-decked bridge, with the central section consisting of a low level bascule span and a high level footbridge. A viaduct is made up of multiple bridges connected into one longer structure. The longest and some of the highest bridges are viaducts, such as the Lake Pontchartrain Causeway and Millau Viaduct. A three-way bridge has three separate spans which meet near the center of the bridge. The bridge appears as a "T" or "Y" when viewed
London Mills Bridge London Mills Bridge The London Mills Bridge was one of nine metal highway bridges in Fulton County, Illinois listed on the National Register of Historic Places. This particular one was located along County Highway 39 as it spans the Spoon River on the north side of London Mills. It was added to the National Register of Historic Places on October 29, 1980, along with the eight other bridges, as one of the "Metal Highway Bridges of Fulton County". Some of the other bridges included London Mill's only other Registered Historic Place, the Indian Ford Bridge. London Mills Bridge and Indian