Six lanes cross two miles of Lake Washington — and nothing underneath is holding them up.
The lake is 214 feet deep, and below the bottom the soft silt keeps going down about as far
again. There is no rock to build on. A suspension bridge would need towers roughly 630 feet
tall — higher than the Space Needle — and SR 520 curves, so a suspension span was never
possible anyway.
So Washington stopped looking for the bottom. The road rides on 77 hollow concrete pontoons,
the largest 360 × 75 × 28 feet and 11,000 tons each, held by 58 anchors on cables three inches
thick and up to 1,000 feet long. The water displaced by the pontoons weighs exactly what the
bridge weighs — which is why concrete floats. And when the lake rises, the road rises with it.
In 1990 crews stored wastewater inside the pontoons of the I-90 bridge next door and removed
the watertight doors. A Thanksgiving storm filled them, and on November 25th a 2,790-foot
stretch of highway sank. Nobody died — it was closed for repairs.
At 7,708.5 feet, the SR 520 Evergreen Point Bridge is the longest floating bridge in the world.
77,000 vehicles cross it every day.
#engineering #seattle #bridge #infrastructure #floatingbridge
source
they found that this bridge has been killing thousand of fish
Made by STUPIDITY
uh steel cable will rust and break in times 😂😂😂😂😂😂
Very interesting.to read
The blind leading the blind its like dumb and dumber in reality non stop we need content creators that are not completely sick and insane..when u look at the curve there r two points a straight bridge is totally possible plus saves the ash vault the curve used it could ho straight road to road remove the curve how stupid I'd not be on it the day it goes under natures always gonna win over sheer idiosy winds can break suspension anyway it's why they used to use faeries and its retarded to b less safe 100 years later please grow brain cells dont follow a crowd off a bridge..literally here😅 wow misinformation syndrome is nasty
I've driven over this with a 40' school bus full of kids. It's stable. 😊
Not a lake, rather a fjord.
I wouldn't cross it 😮
The Evergreen floating bridge.
This gives me the creeps. I would never cross that bridge. I know how to swim, but I'm old and in terrible condition. There's no way I could swim a mile to shore.
Its called a floating bridge!!
Strange How that works…
I've driven on the I 90 bridge
That's a wild ride. I used to make it once a month or so.
anyone from the area knows it is Just a floating bridge we refer to it as such.
This is amazing! More amazing than my New York Mets! Seriously though I'd love to drive this highway one day.
Washington always has problems with bridges. Tacoma Narrows, and another.
Is this the bridge that had the "bulge" that caused a lot of accidents?
There are three floating bridges. Two crossing Lk Washington and one on Hood Canal Two of them have sank and were replaced
As long as they displace at least as much water as they weigh, the concrete blocks will float.
É mais fácil contratar chineses!
What are the cables anchored to, if it's all mud?
I swear I've had a nightmare when I was younger about this bridge being under water as we were driving on it
There’s more information in the comments than in the video. Thanks everyone for all the missed information I was asking myself after the video.
Been alive here since 1969
I rarely use either bridge
They've sank, they've malfunctioned
I just go around
Thankfully it's not my everyday drive
Why cant they use this technology in Hawaii?
Why would they store waste water in the boxes!? Were they TRYING to sink it? SMH
If I ever make it to Seattle, i will have to try it out
YES they did. Yet she is still being TOXIC to herself and protecting that piece of shit…
Anything to move the mighty automobile across the earths surface. Spare no expense.
ABSOLUTELY REMARKABLE…🤩👍🏻
Worst AI ever