These pontoon bridges are semi-permanent floating bridges located throughout the world. Four of the five longest floating bridges in the world are in Washington state.
These pontoon bridges are semi-permanent floating bridges located throughout the world. Four of the five longest floating bridges in the world are in Washington state.
| # | Bridge | Location | Length | Year |
|---|---|---|---|---|
| 1 | SR 520 Albert D. Rosellini Evergreen Point Floating Bridge | Washington state, US | 7,710 feet (2,350 m) | 2016 |
| 2 | Lacey V. Murrow Memorial Bridge | Washington state, US | 6,620 feet (2,018 m) | 1940 1993 (rebuilt) |
| 3 | Hood Canal Bridge | Washington state, US | 6,521 feet (1,988 m) | 1961 1982 (rebuilt) |
| 4 | Demerara Harbour Bridge | Guyana | 6,074 feet (1,851 m) | 1978 |
| 5 | Homer M. Hadley Memorial Bridge | Washington state, US | 5,811 feet (1,771 m) | 1989 |
| 6 | Berbice Bridge | Guyana | 5,153 feet (1,571 m) | 2008 |
| 7 | Nordhordland Bridge | Norway | 4,086 feet (1,245 m) (the floating bridge part) | 1994 |
The former Albert D. Rosellini Evergreen Point Bridge, at 7,578 feet (2,310 m), built in 1963, was the longest floating bridge in the world until the replacement bridge opened in 2016.
Lake Washington is a large freshwater lake adjacent to the city of Seattle, Washington, United States. It is the largest lake in King County and the second largest natural lake in the state of Washington, after Lake Chelan. It borders the cities of Seattle on the west, Bellevue and Kirkland on the east, Renton on the south, and Kenmore on the north, and encloses Mercer Island. The lake is fed by the Sammamish River at its north end and the Cedar River at its south.
A pontoon bridge, also known as a floating bridge, uses floats or shallow-draft boats to support a continuous deck for pedestrian and vehicle travel. The buoyancy of the supports limits the maximum load that they can carry.
Okanagan Lake is a lake in the Okanagan Valley of British Columbia, Canada. The lake is 135 km (84 mi) long, between 4 and 5 km wide, and has a surface area of 348 km2.
State Route 520 (SR 520) is a state highway and freeway in the Seattle metropolitan area, part of the U.S. state of Washington. It runs 13 miles (21 km) from Seattle in the west to Redmond in the east. The freeway connects Seattle to the Eastside region of King County via the Evergreen Point Floating Bridge on Lake Washington. SR 520 intersects several state highways, including Interstate 5 (I-5) in Seattle, I-405 in Bellevue, and SR 202 in Redmond.
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/Union Bay district of Seattle.
The Lacey V. Murrow 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 that carries the eastbound lanes of Interstate 90 across Lake Washington from Seattle to Mercer Island. Westbound traffic is carried by the adjacent Homer M. Hadley Memorial Bridge.
The Hood Canal Bridge is a floating bridge in the northwest United States, located in western Washington. It carries State Route 104 across Hood Canal in Puget Sound and connects the Olympic and Kitsap Peninsulas. At 7,869 feet in length, it is the longest floating bridge in the world located in a saltwater tidal basin, and the third longest floating bridge overall. It opened in 1961 and was the second concrete floating bridge constructed in Washington. Since that time, it has become a vital link for local residents, freight haulers, commuters, and recreational travelers. The convenience it provides has had a major impact on economic development, especially in eastern Jefferson County.
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 the fifth-longest of its kind in the world, at 5,811 feet.
The Silver Jubilee Bridge crosses the River Mersey and the Manchester Ship Canal at Runcorn Gap between Runcorn and Widnes in Halton, England. It is a through arch bridge with a main arch span of 361 yards. It was opened in 1961 as a replacement for the Widnes–Runcorn Transporter Bridge. In 1975–77 the carriageway was widened, after which the bridge was given its official name in honour of the Queen's Silver Jubilee. It carries the A533 road and a cantilevered footway. The bridge is recorded in the National Heritage List for England as a designated Grade II listed building. The bridge was closed to vehicles for refurbishment upon the opening of the new Mersey Gateway Bridge, but reopened as a toll bridge in February 2021.
The Bergsøysund Bridge is a pontoon bridge that crosses the Bergsøysundet strait between the islands of Aspøya and Bergsøya in Møre og Romsdal county, Norway. The bridge is 931 metres (3,054 ft) long, the longest span is 106 metres (348 ft), and the maximum clearance to the sea is 6 metres (20 ft). The bridge has 13 spans.
Navigable aqueducts are bridge structures that carry navigable waterway canals over other rivers, valleys, railways or roads. They are primarily distinguished by their size, carrying a larger cross-section of water than most water-supply aqueducts. Roman aqueducts were used to transport water and were created in Ancient Rome. The 662-metre (2,172 ft) long steel Briare aqueduct carrying the Canal latéral à la Loire over the River Loire was built in 1896. It was ranked as the longest navigable aqueduct in the world for more than a century, until the Magdeburg Water Bridge in Germany took the title in the early 21st century.
The William R. Bennett Bridge is a pontoon bridge in the Okanagan Valley of British Columbia, Canada. Completed on May 25, 2008, the bridge replaced the older Okanagan Lake Bridge built in 1958 to link Downtown Kelowna to West Kelowna across Okanagan Lake as part of Highway 97.
The Itchen Bridge is a bridge over the River Itchen in Southampton, Hampshire. It is a high-level hollow box girder bridge. It is located about a mile from the river mouth. The bridge spans 870 yards (800 m), is 92 feet (28 m) at its highest point and weighs 62,000 tons. The bridge connects the A3025 Portsmouth Road to Southampton. It was built to replace the former chain ferry, known as the Floating Bridge, that crossed the river at that point. The bridge's set of blue energy-saving lights can be seen from up to 5 miles (8 km) down Southampton Water from the bridge.
The Okanagan Lake Bridge was a three-lane, 650-metre (2,133-foot) long floating bridge in British Columbia, Canada. It crossed Okanagan Lake, connecting the Westside area to Kelowna on the lake's eastern side. Taller boats such as sailboats were able to pass under the lift span which was located at the east end of the bridge.
The Pile–Pontoon Railroad Bridge was a floating bridge that crossed the Mississippi River in northern Iowa.
The 1915 Çanakkale Bridge is a road suspension bridge in the province of Çanakkale in northwestern Turkey. Situated just south of the coastal towns of Lapseki and Gelibolu, the bridge spans the Dardanelles, about 10 km (6.2 mi) south of the Sea of Marmara. The bridge is the longest suspension bridge in the world—with a main span of 2,023 m, the bridge surpasses the Akashi Kaikyo Bridge (1998) in Japan by 32 m (105 ft).
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, as well as the world's widest measuring 116 feet (35 m) at its midpoint.
The Dardanelle pontoon bridge was a floating bridge on the Arkansas River connecting Pope and Yell counties at Dardanelle, Arkansas. The bridge was used for nearly four decades in the late 19th and early 20th centuries, except for periods when its operation was interrupted by high river flows or other disruptions.
there have been pontoon bridges which lasted many centuries due to successive repairs and rebuilds. A good example is [...] Triana bridge, which was a pontoon bridge for almost 700 years, from the twelfth century, when the Moors built it
Although it has been rebuilt a number of times, its general plan remains essentially the same as the day it was completed. Its pontoons have disintegrated when the receding of the river has left them high and dry and they have sunk in periods of high water. They have broken loose in flood and drifted out of the memory of men; they have gone down under the weight of snow and ice. Yet always they have been salvaged or rebuilt or replaced or recovered and the highway thrown again across the river...
