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A pontoon bridge is a collection of specialized, shallow draft boats or floats, connected together to cross a river or canal, with a track or deck attached on top. The water buoyancy supports the boats, limiting the maximum load to the total and point buoyancy of the pontoons or boats. [ 2 ] The supporting boats or floats can be open or closed ...
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.
Toll. $1.25–$6.30. Location. The Evergreen Point Floating Bridge, also known as the 520 Bridge and officially the Governor Albert D. Rosellini Bridge, carries Washington State Route 520 across Lake Washington from Seattle to its eastern suburbs. The 7,710-foot-long (2,350 m) floating span is the longest floating bridge in the world, [3] as ...
The Murrow Bridge is the second-longest floating bridge in the world, at 6,620 ft (2,020 m) (the longest is the Governor Albert D. Rosellini Bridge–Evergreen Point, a few miles north on the same lake). The original Murrow Bridge opened in 1940, and was named the Lake Washington Floating Bridge.
The gates on the dam release or store water to maintain the lake within a 2 ft (0.61 m) range of 20 to 22 ft (6.1 to 6.7 m) above sea level. Maintaining this lake level is necessary for floating bridges, mooring facilities, and vessel clearances under bridges. [2]: 2 "Smolt flumes" in the spillway help young salmon to pass safely downstream.
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 Hobart Bridge was of unique design and construction, and the first of its type anywhere in the world. It was a floating bridge with a lift span, constructed of hollow concrete pontoons, 24 in all, connected together forming a crescent shape curved upstream, and anchored in the middle. The bridge was constructed in 12-pontoon sections which ...
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).