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As part of the balanced cantilever construction on the south column of Pier 2 crews are pouring concrete that will help support the new roadway. This crew is inside the formwork that allows the balanced cantilever construction.
Looking northeast from the current SR 520 bridge we can see work continuing within the Pier 1 cofferdam as the south and north columns begin to take shape. On shore in Medina we can see the north and south columns of Pier 2.
The blue waters of Lake Washington are teeming with activity as the new SR 520 floating bridge takes shape. Looking east toward Medina, longitudinal pontoons T, U, and V have been joined together with the eastern-most cross pontoon (Pontoon W) along the north side of the existing floating bridge. Just north of the joined pontoons, crews work to join supplemental stability pontoons to pontoons Q and R.
More information about the new SR 520 floating bridge is available on our website.
Under cloudy skies Pontoon Q was guided through the Ship Canal near Fremont as it makes its way toward Lake Washington.
Pontoon Q is one of the four longitudinal pontoons constructed in the second cycle of pontoons in Aberdeen.
A CANDID MOMENT is the topic for Friday 17th October 2014
... they found some moss, leaves, dried pine tree resin, interesting stones, and had a few adventures along the way. Fun to be a kid.
The Fremont Bridge is one of the lowest bridges in the state. The bridge has a clearance of only 30 feet, making the tugboats pushing Pontoon Q too tall to fit safely beneath.
Also playing it safe was this kayaker who kept his distance from the 11,100 tons pontoon passing through.
With the last form removed the north column is ready for the next phase of construction.
Pier 2 is a land-based pier in Medina.
Photo © Tristan Savatier - All Rights Reserved - License this photo on www.loupiote.com/11520931334
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This is one of the 18 temporary pontoon bridges (i.e. floating bridges) installed during the Kumbh Mela 2013 festival near Allahabad (India).
This pontoon bridge is over the Ganges (Ganga) river. Those floating bridges are built on top of large empty metal tanks, and are anchored to the river bottom with ropes on the upstream side of the bridge. Those bridges can support trucks up to 10 Tons, but to be safe, the maximum weight was set to 5 Tons. Those bridges are mostly used for pedestrian traffic. During high affluence periods when large crowds are crossing the floating bridges, bridges are one-way, with alternating direction for each other bridge. This rule was taken after a stampede in a previous year caused the bridge railing to fail and many people to fall in the river and drawn (most of the Hindu pilgrims cannot swim!).
The water was very low in the Ganges river at the time, so in fact this bridge was not floating, but just sitting on the sandy bottom of the shallow river.
Kumbh Mela is the largest festival on Earth, taking place once every 12 years, with more than 50 million Hindu pilgrims gathering to pray and bathe in the holy Ganges river.
For more photos and info about the Kumbh Mela festival, read the album description.
If you like this photo, follow me on instagram (tristan_sf) and don't hesitate to leave a comment or email me.
Crews on Lake Washington moved two more pontoons into their final position for the new SR 520 floating bridge. The new bridge now reaches over a mile from the Medina shoreline.
Marine traffic can no longer travel through the SR 520 drawspan. For more information regarding marine navigation changes on Lake Washington around SR 520, please visit the SR 520 drawspan information page.
While a Bidwell machine is used to compress and smooth the concrete, crews also work to smooth certain sections by hand.
Over the weekend of May 30 to June 2, SR 520 was closed for SR 520 West Connection Bridge construction. The West Connection Bridge will connect the new floating bridge to the existing west approach. Find out more about the new SR 520 on our website.
St. Achilius is today a very small islet on the Prespa Lake, connected by a floating bridge to the shore. Tsar Samuil of Bulgaria built a fortress and the church of St. Achilius during the 10th. century.
Ancient and Byzantine ruins can be seen around the islet which in the past was a peninsula into the lake, but it sank and, in fact, one can still see at the bottom of the lake the ancient pavement that led to the edge of the peninsula.
The coffer cell was brought to Lake Washington on a barge late in the evening of Nov. 21, 2013. The following morning, WSDOT hosted a media boat tour to see the equipment first-hand.
Draft lines painted on the pontoons indicate water levels relative to the pontoons. The pontoons require a 10-and-a-half-foot tide to be floated out of the basin.
Beginning July 27, 2013, crews floated eight supplemental stability pontoons out of the casting basin in which they were constructed, at the Concrete Technology Corporation site in Tacoma, WA. These pontoons are the third of six of cycles of pontoons to be completed at this site.
After each cycle, pontoons are inspected and temporarily moored prior to being towed to Lake Washington and used in assembly of the new SR 520 floating bridge.
Crews work together to skillfully pour concrete to join a smaller supplemental stability pontoon with larger longitudinal pontoon in the east side staging area near Medina.
Once supplemental stability pontoons are joined with their corresponding longitudinal pontoon, crews will then join the longitudinal pontoon with other longitudinal pontoons to form the new SR 520 floating bridge.
More information about the new SR 520 floating bridge is available on our website.
With the south span of the east approach in Medina complete, crews have begun balanced cantilever construction on the north span. Once complete, the north span will carry westbound traffic between Medina and the new SR 520 floating bridge.
Learn more about balanced cantilever construction on page 2 in our construction update newsletter.
Progress on the new SR 520 floating bridge continues as crews move two more pontoons into their final position on Lake Washington.
See a time-lapse video of this pontoon joining on YouTube.
Visit the SR 520 pontoon tracking and bridge assembly page for the latest updates on bridge construction progress.
This photo was taken high above the Concrete Technology Corp. site in a tower crane. The six supplemental stability pontoons for the new SR 520 floating bridge were seen in the basin, which had been flooded with water from the Port of Tacoma.
Excavators work quickly on the final section of a deep trench crossing all lanes of SR 520 in Bellevue. The job requires careful choreography in order to complete work and reopen the highway in time for the Monday morning commute.
A new, larger culvert will improve fish migration and is the first of eight culverts crossing SR 520 that will be installed between Medina and Bellevue during the next three years.
SR 520 Floating Bridge and Landings construction manager Greg Meadows updates members of the media just minutes before crews installed the final low-rise roadway deck section for the floating bridge.
Using a barge-mounted crane, crews lowered the last of 776 precast, interlocking roadway deck sections onto the new floating bridge. The setting of this final, 100-ton deck section came less than a year after crews set the first low-rise roadway deck section on Sept. 8, 2014. More information about the new SR 520 floating bridge is available on our website.
On Aug. 14, 2013, crews worked to complete the final steps before Pontoon T could be floated out of the drydock in Portland, Ore. Crews are applying waterproofing to the outside of the pontoon.
Photo © Tristan Savatier - All Rights Reserved - License this photo on www.loupiote.com/11229460934
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Group of Hindu pilgrims in saffron-colored clothes, walking. In the back one of the pontoon floating bridges over the Ganges river.
Photo taken at the Kumbh Mela 2013 festival near Allahabad (India).
Kumbh Mela is the largest festival on Earth, taking place once every 12 years, with more than 50 million Hindu pilgrims gathering to pray and bathe in the holy Ganges river.
For more photos and info about the Kumbh Mela festival, read the album description.
If you like this photo, follow me on instagram (tristan_sf) and don't hesitate to leave a comment or email me.
This cute couple hopped out of the Ship Canal to join our photographer as they watched Pontoon Q make its way through to Lake Washington.
According to one duck, “it was quack-tacular!”
Along the new bike/ped path are rest stops, called belvederes. Each belvedere features a different interpretive sign showcasing topics important to the bridge and surrounding environment.
The sign closest to Medina and the eastern sentinel is about engineering of the 520 floating bridges.
Along the 14-foot bike and pedestrian path there are five pull-out areas called belvederes. Each belvedere includes a seat wall with these built-in benches and a textured glass windscreen.
This photo is of the belvedere at the east end of the floating bridge featuring a plaque honoring Joe Arrants who lost his life while working on the new bridge.
Crews working near Medina piece together one of five new belvederes that will be installed along the 14-foot wide bicycle and pedestrian path on the new SR 520 floating bridge.
These belvederes will offer a resting place for those travelling across the bridge. Each belvedere will feature benches and interpretive signage.
More information about the new SR 520 floating bridge is available on our website.
After the epoxy injection is complete, crews cut of the tubes. Epoxy injections are used to seal cracks greater than .006 inches, the width of a human hair.
Cross pontoon A was transported through the Hiram M. Chittenden Locks on June 7, 2013. The pontoon was built in Aberdeen, Wash. and will support a new SR 520 floating bridge on Lake Washington.
(WSDOT-Aug. 21, 2010) The drawspan of the SR 520 bridge opens during the annual maintenance and inspection closure. The Washington State Department of Transportation gave a tour of the State Route 520 floating bridge Aug. 21. Speakers highlighted efforts to maintain the bridge, which opened in 1963. Toll collections are scheduled to begin in spring 2011 and construction of a new floating bridge is scheduled to begin in 2012. The new bridge is scheduled to open to traffic in 2014.
As crews work to lay the first section of roadway deck for the new SR 520 West Connection Bridge, concrete is tested. In this photo, crews are testing for air content in one of the first truckloads of concrete. In total, 25 trucks of concrete will be needed for this first section of deck.
Over the weekend of May 9-12, westbound SR 520 was closed to allow crews to build the first section of roadway deck for the new SR 520 West Connection Bridge. Concrete is pumped from the existing bridge because, until it is completed, the new West Connection Bridge can only be accessed from the water.
The West Connection Bridge will connect the new floating bridge to the existing west approach. When the new West Approach Bridge North is completed, the West Connection Bridge will carry eastbound traffic.
Find out more about the new SR 520 on our website.
Construction crews have been making progress in building the new West Connection Bridge as the new alignment begins to take shape alongside the current SR 520 bridge. Track construction progress on our website.
Under cloudy skies in Medina, a team work to install rebar for the east high-rise roadway deck for the new SR 520 floating bridge. Green, epoxy-coated rebar is used to protect the deck from rust and corrosion.
Visit the SR 520 pontoon tracking and bridge assembly page for the latest updates on bridge construction progress.
Several television news crews participated in the WSDOT-led boat tour of the SR 520 floating bridge construction area. Photo taken Nov. 22, 2013.
Crews work to assemble wooden girder braces for the new West Connection Bridge. Girders are being placed on top of the pier columns and will support the roadway deck when the bridge is complete.
In order to complete the final step of the repair process, crews must drill holes into the sides of the pontoon. Post-tension cables will be inserted thorough these holes and stretched tight to add strength to the concrete. Concrete "blisters" are then used to cover the ends of the cables.
This is what a crack repair looks like after crews have injected the epoxy sealant. Epoxy injection is used to repair cracks that are .006 inches or more. .006 inches is about the width of a single human hair, so crews must widen the crack slightly to inject the epoxy sealant.
The red marking that you see around the edges shows were inspectors indicated the hair width cracks, prior to repairs. The white tubes are where the epoxy was injected into the crack. These will be cut off and smoothed out prior to application of the carbon-fiber wrap.
SR 520 project managers explained the technical details of floating bridge construction to news media on Nov. 22, 2013.
Crews in Medina continue to construct the roadway for the new SR 520 floating bridge. Here you can see several stages of roadway work: in the foreground, work continues on the low-rise roadway deck. Beyond that girders for the east high-rise have been installed, green epoxy-coated rebar awaits concrete and fresh concrete cures under a white blanket.
Visit the SR 520 pontoon tracking and bridge assembly page for the latest updates on bridge construction progress.
The new SR 520 floating bridge takes shape on Lake Washington as crews join pontoons and install low-rise roadway deck sections.
Visit the SR 520 pontoon tracking and bridge assembly page for the latest updates on bridge construction progress.
With the assistance of two crew members, a derrick barge lifts and places one of 776 low-rise roadway deck sections needed for the new SR 520 floating bridge. Each deck section is “match cast” in Kenmore so when they are assembled on Lake Washington the sections fit neatly together. Photo courtesy of HDR.
Visit the SR 520 pontoon tracking and bridge assembly page for the latest updates on bridge construction progress.
On November 21, 2013 this coffer cell was floated onto Lake Washington and will be used to complete repairs on Pontoons U and V. The coffer cell will create a dry work environment where workers will complete pontoon repairs as part of the SR 520 Floating Bridge and Landings project.
Did you know that concrete needs to be wet in order to cure properly? For the SR 520 West Connection Bridge crews use a special machine which sprays water onto blankets which are then laid on top of the new roadway deck to help the fresh concrete cure. The wet blankets are left in place for 14 days.
Over the weekend of May 30 to June 2, SR 520 was closed for SR 520 West Connection Bridge construction. The West Connection Bridge will connect the new floating bridge to the existing west approach. Find out more about the new SR 520 on our website.
This coffer cell was built to complete repairs to Pontoons U and V as part of Cycle 1 pontoon repairs. The coffer cell will allow workers to make repairs to the end wall and bottom of the pontoons, which are typically underwater, by creating a dry working environment.
When attached to the ends of Pontoons U and V, the coffer cell will serve as a portable drydock. Once in place, crews will pump water out of the coffer cell so they have a dry work environment to complete repairs.
Looking across Lake Washington from Seattle, the new West Connection Bridge is continuing to take shape just north of the existing SR 520 bridge. Once complete in fall 2013, the West Connection Bridge will connect the new floating bridge to the existing SR 520 approach. Adjacent to the construction zone is the west side staging area, where pontoons are currently moored until they are needed for the new floating bridge.