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・ List of Sealab 2021 episodes
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List of Seattle bridges
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List of Seattle bridges : ウィキペディア英語版
List of Seattle bridges

The city of Seattle has multiple bridges that are significant due to their function, historical status, or engineering. Bridges are needed to mitigate the city's waterways and hilly topography. Twelve bridges have been granted historical status by the city, federal government, or both. Seattle also has some of the only permanent floating pontoon bridges in the world.
Lake Washington and Puget Sound are to the east and west of the city, respectively. They connect via a series of canals and Lake Union that are collectively known as the Lake Washington Ship Canal. The four double-leaf bascule bridges crossing the Ship Canal are the oldest in the city, having opened between 1917 and 1930. The easternmost—the Montlake and University bridges—connect neighborhoods south of the canal to the University District. The Fremont Bridge crosses the center of the canal and is one of the most often raised drawbridges in the world due to its clearance over the water of only . The westernmost crossing of the ship canal is the Ballard Bridge.
The floating bridges carry Interstate 90 and State Route 520 across Lake Washington to the Eastside suburbs. The Governor Albert D. Rosellini Bridge—Evergreen Point is the longest floating bridge in the world, but is due to be replaced. The Lacey V. Murrow Memorial Bridge was already replaced after the original span sunk in 1990 when water filled an open maintenance hatch during refurbishing. Age and the 2001 Nisqually earthquake have damaged several other spans. The risk of future earthquakes has increased the need to replace already deteriorated bridges in the city, such as the Alaskan Way Viaduct and the Magnolia Bridge.
The neighborhoods that make up West Seattle are on a peninsula separated from downtown by the Duwamish River. The West Seattle Bridge is the primary roadway crossing the river. The neighborhood's Spokane Street Bridge is the world's first and only hydraulically operated concrete double-leaf swing bridge.
==List of bridges==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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