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SR 520 - Floating Bridge and Landings Project: What's Happening Now?

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Updated: Nov. 30, 2016

The new SR 520 floating bridge is open to traffic in both directions and decommissioning activities to remove the old bridge from Lake Washington are underway.

Current work

Past work

 

Upcoming nighttime work

Beginning Monday, Oct. 24, and continuing through Dec. 31, crews will work at night to complete several activities including grading of the final construction area, paving, and noise wall construction along the south side of the Evergreen Point Road lid.

Work details:

  • Beginning Monday, Oct. 24, and continuing through Dec. 31, crews will work Monday through Saturday, 7 p.m. to 7 a.m. using excavators, graders and paving machines to complete final construction area paving. Crews will use forklifts to complete the noise wall along the south side of the Evergreen Point Road lid, north of the pedestrian trail.
  • The graphic below highlights the remaining work in Medina, including estimated timeframes for each activity.
    Residents can expect to see and hear the following:
  • Large construction equipment such as an excavator, lights and noise from machinery and other equipment.
  • Crews will minimize construction noise by using ambient back-up alarms and limiting machine idling when possible.


Click the image above for a graphic (pdf 96kb) showing the remaining work in Medina, including estimated timeframes for each activity.

Residents can expect to see and hear the following:

  • Large construction equipment such as an excavator, lights and noise from machinery and other equipment.
  • Crews will minimize construction noise by using ambient back-up alarms and limiting machine idling when possible.

Lane and ramp closures

Decommissioning activities to remove the old floating bridge from Lake Washington are underway and will continue through the end of 2016. During this time, drivers and transit riders can expect intermittent lane closures. Visit the SR 520 Orange Page for closure information.

 
Decommissioning information and materials

Decommissioning activities by Kiewit/General/Manson, A Joint Venture (KGM) to remove the old SR 520 floating bridge from Lake Washington are underway and will continue through the end of 2016. 

Some materials will be dismantled on barges on Lake Washington, while others will be dismantled on land. The majority of the bridge materials will be dismantled onsite and hauled to concrete recycling facilities, where most of the materials will be processed for reuse as dry aggregate for other paving projects.

The 31 old bridge pontoons will remain intact and be removed from Lake Washington through the Hiram M. Chittenden Locks in Ballard. They have been sold to TrueNorth Operations Group . In the past, TrueNorth has converted used pontoons into docks, artificial reefs, and wharfs.

Decommissioning plans for the old SR 520 floating bridge
Click the image above for a decommissioning folio (pdf 392kb) showing a timeline of bridge decommissioning activities.

See the Lake Washington , Medina , and Seattle sections below for more information about specific work occurring in these areas, or you can learn more about our bridge-removal work through these resources:

July 14, 2016 - Bridge decommissioning meeting with Department of Ecology, elected officials and interested stakeholders

Other meeting materials

Lake Washington

All Lake Washington decommissioning work activities will occur within the project limits of construction (within approximately 1,000 feet of the new bridge). Activities include:

  • Removing the old bridge roadway deck is complete.
  • Removing the east and west transition spans (June 2016) and pier columns (through October 2016).
  • De-tensioning and separating old pontoons (through November 2016).
  • Utilizing the east side staging area near Medina to dismantle old bridge materials including concrete and roadway barriers (through July 2016).
  • Moving decommissioned pontoons from the east side staging area to the west side staging area near Seattle prior to final removal from Lake Washington via the Hiram M. Chittenden Locks in Ballard (June through December 2016).
  • Removing old anchor cables (through December 2016).

During these decommissioning activities, neighbors can expect to see: barges, cranes, excavation equipment, loaders, trucks and protective screening above work barges. Nearby residents can also expect to hear a loud, consistent noise similar to an industrial fan and the cutting and dismantling of materials. KGM will utilize best management practices throughout the decommissioning process. 

 
Medina

Decommissioning work activities on land in Medina include:

  • Removing the old east approach and transition span including roadway deck and pier columns.
  • Utilizing the east side staging area north of the new floating bridge near the Medina shoreline to dismantle old bridge materials including concrete and roadway barriers.
  • Utilizing approved truck haul routes through Medina, Clyde Hill, and Bellevue (pdf 326 kb).

Additional decommissioning information was included in the April 14 notification  (pdf 52 kb) sent to Medina neighbors and in materials from the April 21 public information session  (pdf 500 kb).

During these decommissioning activities, neighbors can expect to see: barges, cranes, excavation equipment, loaders, trucks and protective screening above work barges. Nearby residents can also expect to hear a loud, consistent noise similar to an industrial fan and the cutting and dismantling of materials. KGM will utilize best management practices throughout the decommissioning process.

In addition to decommissioning activities, crews are working to:

  • Conduct air monitoring in Medina to gauge what level of particulate matter may drift from bridge-removal activities on Lake Washington. This fact sheet provides more information on the monitoring effort (pdf 152 kb).
  • Complete noise walls south of the new bridge.
  • Prepare for construction of the new viewpoint trail south of the new bridge.
  • Prepare for landscaping installation and shoreline restoration activities.

Seattle

Seattle decommissioning work activities include:

  • Removing the old west approach and transition span including roadway deck and pier columns.
  • Utilizing the west side staging area north of the new floating bridge south of Laurelhurst in Seattle to stage decommissioned pontoons prior to final removal from Lake Washington via the Hiram M. Chittenden Locks in Ballard.

Additional decommissioning information was included in the April 18 notification  sent to Seattle neighbors (pdf 502 kb).

During these decommissioning activities, neighbors can expect to see: barges, cranes, excavation equipment, loaders, trucks and protective screening above work barges. Nearby residents can also expect to hear a loud, consistent noise similar to an industrial fan and the cutting and dismantling of materials. KGM will utilize best management practices throughout the decommissioning process.

Crews are currently working on the old floating bridge’s West Approach near Madison Park. Neighbors may hear daytime noise as crews separate and remove girders and other parts of the concrete superstructure. This work is planned to occur between 8 a.m. and 7 p.m. weekdays and 9 a.m. and 7 p.m. on Saturdays.

Due to the dynamic nature of construction, this schedule is subject to change. If you have questions about this work, please contact the KGM construction hotline at 425-576-7098. 

 
Light from new bridge

In early April, we heard from several project neighbors regarding lights that can be seen on the north side of the new SR 520 floating bridge. Based on initial comments, we turned all nonessential lighting off until we could conduct tests on the new lighting.

Based on measurements conducted in May and July, the bulbs on the path were replaced with lower wattage bulbs. For more information about lights on the shared-use path , see the email sent to elected officials and nearby neighbors on July 28, 2016 (pdf 113 kb).

Nov. 17 briefing on RSUP lights with elected officials
On Thursday, Nov. 17, WSDOT staff met with elected officials to review the latest results from evaluations of the lights along the Regional Shared-Use Path (RSUP). See the materials presented at the briefing . (pdf 2.2 mb)

If you have questions or comments concerning lighting on the new bridge, please contact us at SR520Bridge@wsdot.wa.gov
 
Nov. 29 community meeting on RSUP lights
On Tuesday, Nov. 29, WSDOT and representatives from the 46th Legislative District hosted a community meeting to discuss WSDOT’s evaluation of the lights on the SR 520 Regional Shared-Use Path (RSUP). See the materials presented at the briefing :

 
Noise from new bridge

Shortly after the new SR 520 floating bridge opened to westbound traffic in April, WSDOT began receiving concerns from Medina residents regarding sounds coming from the new bridge. At that time we began conducting an investigation that includes collecting sound measurements on both the old and new floating bridges.

We have also heard from some Seattle residents on this topic. As you know, the west end of the new bridge is still in an interim configuration as WSDOT and our contractors work to complete the west approach bridges between Montlake Boulevard and the new floating bridge.

Below you will find our latest updates regarding this topic, including sound measurement readings:

We are keeping track of those who notify us about sounds from the new bridge and will include everyone in future updates. If you have questions or comments concerning this noise question, please contact us at SR520Bridge@wsdot.wa.gov and include ccmail@medina-wa.gov on your email.

  
Bicycle and Pedestrian Path

The new regional shared-use path (RSUP) opened as an out-and-back path from Medina on Friday, July 22. The trail is a continuation of the trail constructed by the Eastside Transit and HOV project, which extends from 108th Ave NE in Bellevue, runs along the north side of SR 520 to the lid at Evergreen Point Road. The path now extends 1.3 miles onto the new floating bridge. When WABN is open to traffic in summer 2017, the path will connect to regional trails in Seattle.

 
Kenmore

Through December 2016, KGM will continue to use the Kenmore site for hauling of materials. This work will only happen during daytime hours.

Casting of the concrete deck sections began in March 2014 and was completed in August 2015. A total of 776 sections were built. These sections form the roadway for the new floating bridge. For more information about the work completed in Kenmore, visit our project page

Tacoma

Construction of the 44 supplemental stability pontoons built in Tacoma was completed in December 2014. At this time, no other SR 520 construction activities are planned in Tacoma. Check out photos of construction in Tacoma on our Flickr page.

Aberdeen

On March 10, 2015, crews floated the sixth and final cycle of pontoons from the casting facility in Aberdeen. The last three pontoons arrived on Lake Washington on April 9, 2015.

You can find more information on the Pontoon Construction Project section of the program website and watch videos of the float-out process on our YouTube page.