Humber Bridge single-span suspension bridge for 16 years from its opening in July 1981, until the opening of the Great Belt Bridge in June 1997, and was relegated to third place with the opening of the Akashi Kaikyō Bridge in April 1998. It is now the eighth longest single-span suspension bridge. The central span, at 1410 m (4640 ft), is the UK's longest. It remains the longest single-span suspension bridge in the world that one can cross on foot or by bicycle. The bridge is crossed twice during the annual Humber Bridge half marathon. In July 2013, work began on introducing a
Otowi Suspension Bridge National Laboratory, which became nationally important during World War II. It was also the only public highway suspension bridge in the state and was the best-rated bridge in the state in a 1987 survey. It was a contributing property in the listing of the Otowi Historic District to the National Register in 1975. Otowi Suspension Bridge The Otowi Suspension Bridge, spanning the Rio Grande River near San Ildefonso, New Mexico, is a wooden suspension bridge built in 1924. It was listed on the National Register of Historic Places in 1997. The bridge has been closed to vehicular traffic since the