Governor Albert D. Rosellini Bridge—Evergreen Point
47.64051 - 122.26019Koordinaten: 47 ° 38 ' 25.8 " N, 122 ° 15' 36.7 " W
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Washington State Route 520
The Governor Albert D. Rosellini Bridge - Evergreen Point, formerly Evergreen Point Floating Bridge, mostly SR 520 Bridge or 520 Bridge, is the longest floating bridge in the world. It is located in the U.S. state of Washington, and leads the Washington State Route 520 from Seattle across Lake Washington in Medina. The length of the floating bridge is 2310 m, 4750 m of the entire building. The bridge is Albert Rosellini, the 15th Governor of Washington, named, which supported the construction of the bridge political.
History
After the construction of the first floating bridge across Lake Washington, Lacey V. Murrow today's Memorial Bridge in 1960, started the construction of a second four-lane floating bridge over the lake, the Evergreen Point Floating Bridge. You should better link the communities on the east coast of the lake of Seattle, and was opened after three years of construction on August 28, 1963. The cost was $ 21 million.
Ursrpünglich was provided at the west end to connect the south extending in the direction of Interstate 90 RH Thomson Expressway to the structure. The project was finally abandoned in 1971 after protests population, although the connection ramps were already built the bridge.
By 1979, a toll of 35 cents was charged by the users in each direction of travel. The toll booths then no longer used have been converted into bus stops.
The bridge was particularly strong community of Redmond, a large population growth: while the Orstschaft 1960 less than 1,500 inhabitants were counted there in 1970 already 11,000. But caused the bridge is also a population growth in the northern part of Bellevue and Kirkland.
In 1988 the bridge in honor of Albert Rosellini in Governor Albert D. Rosellini Bridge - Evergreen Point has been renamed. The bridge was always less the growing traffic powerful, it is used by up to 115,000 vehicles. In addition, showed that they could fail in severe storms or earthquakes. It was therefore sought in 1997 for a replacement of the bridge. At its financing the toll was introduced in 2011 again, which is fed exclusively by electronic means with transponders and license plate cameras without the traffic stop. In the same year also began the construction of the pontoons for the new six-lane bridge, which will be completed end of 2015 or beginning of 2016 soll.Vorlage: Future / In 2 years
Building
Existing bridge
The structure consists of a floating bridge with integrated thrust bridge and adjoining bridge spans, each include a tied arch bridge to cross an opening for shipping. The floating bridge rests on 33 pontoons made of prestressed concrete. The interior is divided by 15 cm thick Scots, the outer walls are 23 cm thick. The pontoons have different sizes, the largest being 110 m long, 4.8 m high and 6700 tons. They are held by 70 mm thick steel cables 62 which are secured to lie on the lake floor concrete anchor in position. The roadway with four lanes is 3.9 meters above the water.
The two segments of the thrust bridge be retracted to open under the 2.2 meter raised floor plates of the neighbor patches. In this case, the front end of the thrust bridge segment on a movable floating pontoon. The thrust bridge is opened both for navigation as well as in strong winds around the floating bridge to relieve them of the forces transmitted by wind and waves forces. The opening is initiated when occur during a quarter-hour gusts above 80 km / hr.
New Bridge
The new bridge will be built north of the existing and to be 35 meters wide. The pontoons of the new building will indeed be 110 m long, but its 8.5 meters high and 23 meters wide. The deck of the new bridge is 6 feet above the water - significantly higher than the old bridge. The new bridge deck is six lanes, two emergency lane and a 4.3 meter wide pedestrian and bike path have.