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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.
The Woolston Floating Bridge switched from chains to wire ropes between 1878 and 1887 and was replaced by a bridge in 1977. In the early 1900s, Canadian engineer William Pitt designed an underwater cable ferry in New Brunswick , which would later be installed on the Kennebecasis River in order to connect the Kingston Peninsula to the ...
A toll bridge until 1946, its common name is the I-90 bridge or Lake Washington Floating Bridge. It was the first floating bridge longer than a mile, and at the time was the longest floating structure in the world. It is now the second longest floating bridge in the world. Hood Canal Bridge. Completed 1961. Spans 6,521 feet (1,988 m).
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
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).
The Evergreen Point Floating Bridge, officially the Governor Albert D. Rosellini Bridge, and commonly called the SR 520 Bridge or 520 Bridge, was a floating bridge in the U.S. state of Washington that carried State Route 520 across Lake Washington, connecting Medina with the Montlake neighborhood of Seattle.