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A treadway bridge was a multi-section, prefabricated floating steel bridge supported by pontoons carrying two metal tracks (or "tread ways") forming a roadway. Depending on its weight class, the treadway bridge was supported either by heavy inflatable pneumatic pontons or by aluminum-alloy half-pontons.
The new Evergreen Point Floating Bridge was designed to be more stable in stronger winds and raised the bridge deck much higher above the surface of the lake than the old bridge. Unlike the original floating bridge, where the road surface is directly on pontoons connected end-to-end, the new bridge featured pontoons laid north–south ...
At 7,869 feet (1.490 mi; 2.398 km) in length (floating portion 6,521 feet (1.235 mi; 1.988 km)), it is the longest floating bridge in the world located in a saltwater tidal basin, and the third longest floating bridge overall. [3] It opened in 1961 and was the second concrete floating bridge constructed in Washington.
Submerged floating tunnels can be anchored to the seafloor (left) or suspended from a pontoon (right) A submerged floating tunnel (SFT), also known as submerged floating tube bridge (SFTB), suspended tunnel, or Archimedes bridge, is a proposed design for a tunnel that floats in water, supported by its buoyancy (specifically, by employing the hydrostatic thrust, or Archimedes' principle).
Lacey V. Murrow Memorial Bridge, which carries the highway's eastbound traffic and is the second longest floating bridge in the world; Homer M. Hadley Memorial Bridge, which carries the highway's westbound traffic and is the fifth longest floating bridge in the world; it is planned to also carry light rail trains
The floating bridge was replaced as it outlived its usefulness and was incapable of supporting the traffic levels. The construction of the new replacement bridge—the William R. Bennett Bridge—began in 2005 and was completed in 2008. The new bridge opened on May 25, 2008, and the old bridge closed May 31, 2008. It was decommissioned in 2009.
The PMP Floating Bridge (Russian: Понтонно-мостовой парк, ПМП "pontoon / bridge park") is a type of mobile pontoon bridge designed by the Soviet Union after World War II. The bridge's design enables for a quick assembly of its parts. [1] It has a carrying capacity of 60 tons. [1]
The Third Lake Washington Bridge, officially the Homer M. Hadley Memorial Bridge, is a floating bridge in the Seattle metropolitan area of the U.S. state of Washington. It is one of the Interstate 90 floating bridges, carrying the westbound lanes of Interstate 90 across Lake Washington between Mercer Island and Seattle. The floating bridge is ...