Governor Albert D. Rosellini Bridge — Evergreen Point
Coordinates: 47 ° 38 ′ 26 " N , 122 ° 15 ′ 37" W.
 Governor Albert D. Rosellini Bridge — Evergreen Point
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| Convicted | Washington State Route 520 | |
| Subjugated | Lake Washington | |
| place | Seattle , Medina | |
| Entertained by | Washington State Department of Transportation | |
| Building number | 520/8 | |
| construction | Floating bridge | |
| overall length | 4750 m | |
| width | 18.3 m | |
| building-costs | 21 million US dollars | |
| opening | August 28, 1963 | |
| closure | April 2016 | |
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The Governor Albert D. Rosellini Bridge — Evergreen Point , formerly Evergreen Point Floating Bridge , mostly SR 520 Bridge or 520 Bridge , was the longest floating bridge in the world until it was replaced in 2016 by a new construction, the SR 520 Albert D. Rosellini Evergreen Point Floating Bridge was replaced. It was located in the US state of Washington and led the Washington State Route 520 from Seattle on the Lake Washington to Medina . The length of the floating bridge was 2310 m, the entire structure 4750 m. The bridge, like its successor, was afterAlbert Rosellini , the 15th Governor of Washington, who politically supported the construction of the bridge.
history
After the construction of the first floating bridge over Lake Washington, today's Lacey V. Murrow Memorial Bridge , construction of a second four-lane floating bridge over the lake began in 1960, the Evergreen Point Floating Bridge . It should better connect the communities on the east coast of the lake to Seattle and was opened on August 28, 1963 after a three-year construction period. The construction costs were 21 million dollars .
It was originally planned to connect the RH Thomson Expressway , which runs south towards Interstate 90 , to the structure at the west end . The project was finally abandoned in 1971 after population protests, although the connecting ramps to the bridge had already been built.
Until 1979, users were charged a toll of 35 cents in each direction of travel . The toll booths that were no longer used afterwards were converted into bus stops .
The bridge brought a large increase in population , especially for the municipality of Redmond : While the village had fewer than 1,500 inhabitants in 1960, it was 11,000 in 1970. The bridge also caused population growth in the northern part of Bellevue and in Kirkland .
In 1988 the bridge was renamed Governor Albert D. Rosellini Bridge — Evergreen Point in honor of Albert Rosellini . The bridge was less and less able to cope with the increased volume of traffic; it was used by up to 115,000 vehicles. It also showed that it could fail in strong storms or earthquakes. Therefore from 1997 a replacement of the bridge was sought. To finance this, the toll was reintroduced in 2011, which was collected exclusively electronically with transponders and license plate cameras without stopping traffic. In the same year, the construction of the pontoons for the new, six-lane bridge, which was completed in April 2016, began.
Building
Swimming bridge (1963-2016)
The structure consisted of a floating bridge with an integrated push bridge and adjoining front bridges, each of which contained a tied arch bridge to cross an opening for shipping. The floating bridge rested on 33 pontoons made of prestressed concrete . The interior was divided by 15 cm thick bulkheads , the outer walls were 23 cm thick. The pontoons were of various sizes, the largest were 110 m long, 4.8 m high and weighed 6,700 tons. They were held in position by 70 mm thick steel cables attached to 62 concrete anchors lying on the lake bed. The four-lane carriageway was 3.9 meters above water.
To open, the two segments of the shear bridge were pulled back under the 2.2 meter raised deck slabs of the neighboring fields. The front end of the thrust bridge segment floated on a movable pontoon. The thrust bridge was opened for shipping as well as in strong winds in order to relieve the floating bridge from the forces exerted by wind and waves. The opening was initiated when gusts of over 80 km / h occurred for a quarter of an hour.
New bridge
The new bridge was built parallel to the existing one to the north and is 35 meters wide. The pontoons of the new structure are 110 meters long, but 8.5 meters high and 23 meters wide. The roadway of the new bridge is 6 meters above the water - significantly higher than that of the old bridge. The new carriageway slab has six lanes, two hard shoulder and a 4.3 meter wide pedestrian and cycle path.
Web links
- Brochure for the opening of the existing bridge (PDF; 4.3 MB)
- SR 520 Evergreen Point Floating Bridge and Landings Project. (PDF; 858 kB) WSDOT, accessed on November 18, 2013 .
Individual evidence
- ^ NRHP Washington State Historic Highway Bridges. (PDF; 77 kB) (No longer available online.) WSDOT, March 21, 2013, archived from the original on December 2, 2013 ; accessed on November 26, 2013 (English). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ SR 520 - Floating Bridge Facts . Washington State Department of Transportation
- ↑ Evergreen Point Floating Bridge opens on August 28, 1963. HistoryLink.org, January 14, 1999, accessed November 18, 2013 .
- ^ SR 520 Bridge Replacement and HOV Program . Washington State Department of Transportation
- ^ A b SR 520 Bridge Replacement, United States of America. roadtraffic-technology.com, accessed on November 18, 2013 (English).
- ↑ Engineering & Construction. WSDOT, accessed November 18, 2013 .
- ↑ Wind, waves batter SR 520 floating bridge. (No longer available online.) KING 5 News, November 2, 2013, archived from the original on November 9, 2013 ; accessed on November 18, 2013 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
