"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 bridge opened in April 2016 and replaced another floating bridge of the same name at the site, which was 130 feet (40 m) shorter."  (Wikipedia)

"The Evergreen Point Floating Bridge stretches across Lake Washington, connecting Seattle to its eastern suburbs. When it opened in 2016, it immediately entered the record books as both the longest and widest floating bridge in the world," the Atlas Obscura says.

"In April 2016, the new Evergreen Point Floating Bridge opened to traffic, carrying Washington State Route 520 across Lake Washington. It was built to replace the previous Evergreen Point Floating Bridge, built in 1963 and closed in April 2016, which previously held the title as the longest floating bridge in the world.

"Supported by 77 pontoons, the new Evergreen Point Floating Bridge has a span of 7,710 feet (2,350 m), 130 feet longer than the bridge it replaced. As such, it currently holds the record as the longest floating bridge in the world. And with its midpoint measuring 116 feet (35 m) across, it’s also the world’s widest floating bridge."

"The Governor Albert D. Rossellini Bridge—Evergreen Point bridge (often called just the SR 520 bridge) in Seattle is the longest floating bridge on the planet. It is 7,497 feet (2,285 meters), or 1.4 miles (metric), long and spans Lake Washington, letting vehicles pass to and from Seattle and Bellevue, Washington," the HowStuffWorks.com says.

"After three years of construction, the four-lane toll bridge opened in 1963. It wasn't the first floating bridge on Lake Washington; that was actually the Lake Washington Floating Bridge, which was built in 1940 and wound up as part of Interstate 90. But the SR 520 bridge is significantly bigger than its forbearer.

"It's four lanes and 60 feet wide and is supported by 33 pontoons. Those individual pontoons are enormous, at around two and a half stories tall, and 360 feet (110 meters) long -- that's longer than four gas tanker semi-trucks placed end to end. The pontoons are secured by 62 anchors that weigh around 77 tons each."

"Lake Washington is 214 feet deep, and the lake bed is too soft to support towers needed for a conventional bridge," the wiredpen.com says.

"A suspension bridge would have been too expensive because the towers “would have to be approximately 630 feet in height, nearly the height of the Space Needle.”

"The Evergreen Point bridge had its own refurbishment and re-opened in 2016 as both the longest and widest floating bridge in the world. The Mercer Island bridges are numbers two and three in global ranking."

"When it came time to replace the world’s longest floating bridge with another even longer one, UTRS was tapped to provide corrosion control solutions for the project," the UTRS.com says.

"The new bridge in Seattle, Washington, spans an astounding 7,708.5 feet over Lake Washington, which is more than 200 feet deep. UTRS performed a cathodic protection design build for corrosion mitigation on all of the bridge’s concrete and high-strength steel structures.

"UTRS developed a closely coupled anode system to mitigate corrosion on high-strength steel anchor cables that were electrically bonded to a massive floating concrete structure. UTRS also developed an anode system to protect the bridge’s 23 floating pontoons, each of which is the length of a football field. In addition to protecting dilution wells, UTRS also fully integrated data readings and remote interruption capabilities into the SCADA system. Any one of the 71 rectifiers on the bridge can be remotely monitored and interrupted."

"If there was ever a good test of the effectiveness of your expansion joints, it would be to recruit 7,000 cyclists, 12,000 runners and 27,000 pedestrians onto the world’s longest floating bridge in its inaugural 24 hours," the Hamilton Kent says.

"And this is exactly what happened for the Gov. Albert D. Rosellini Bridge, more commonly known as SR 520 Bridge, on April 2 – the weekend of the project’s opening celebration. The party included a 10-mile run, 20-mile bike ride, and fun fair on the bridge complete with a ribbon cutting ceremony.

"Connecting suburbs such as Bellevue, Washington, with the city of Seattle, the original SR 520 Bridge was built in 1963 as a four-lane toll bridge and needed to be replaced due to increasing population and traffic, as well as general deterioration. Its replacement exceeded its length by 130 feet."

"Floating bridges can be separated into two different types – permanent floating bridges and non-permanent floating bridges. The basic idea behind their construction is the same, to allow people or vehicles to cross bodies of water, but it’s their more precise purpose that differs," the discoveringwashingtonstate.com says.



"Floating bridges are normally used in situations in which engineers are working with bodies of water that are both very deep and very wide – this paired with soft bottom soil (whether of a lake or the ocean) makes ordinary bridges an impossibility. A floating bridge becomes the best alternative.

"The Evergreen Point Floating Bridge is officially named the Governor Albert D. Rosellini Bridge. It’s rarely called that and is usually referred to as the 520 Bridge, or SR 520 (SR = State Route). The bridge crosses Lake Washington from Seattle to the suburbs east of the lake (including Bellevue, Kirkland, and Redmond, and is approximately 7,500 feet long. It is the longest floating bridge in the world."

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