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SR 520 - Floating Bridge and Landings Project: Kenmore Industrial Park

What is Kenmore Industrial Park?

The Kenmore Industrial Park (KIP), also known as the Lakepointe Site, is a 44.1 acre property located at 6525 N.E. 175th St. in Kenmore, Washington. It is owned by Lakepointe Inc. This property fronts Lake Washington on its north and west boundaries and the Sammamish River on its southern boundary. The site is accessed from a driveway on N.E. 175th Street.

Map of Kenmore Industrial Park and surrounding area
View larger version of this map. (pdf 3 mb)

What is KGM and what is its role?

Kiewit/General/Manson, A Joint Venture (KGM) is the design-build contractor for the SR 520 Floating Bridge and Landings Project. KGM leased the site from the property owner in order to conduct construction activities for replacement of the SR 520 floating bridge and is responsible for obtaining all construction permits for work at the site.

What is WSDOT's role?

WSDOT is responsible for replacing the SR 520 floating bridge. The agency has contracted KGM to complete design and construction of the new bridge. WSDOT oversees, inspects and ultimately approves KGM's work.

WSDOT is also responsible for the National Environmental Policy Act and State Environmental Policy Act documentation for the SR 520 Bridge Replacement and HOV Program.

To date, WSDOT has participated in two public meetings regarding work at the Kenmore Industrial Park. View the presentations presented during these public meetings for more information about the work planned in Kenmore.

What additional documentation has been completed for the Kenmore Industrial Park? 

The KIP is a former industrial landfill that is currently under Model Toxics Control Act (MTCA) consent decree with the Washington State Department of Ecology (Ecology). A consent decree is a formal legal agreement filed in court that requires cleanup work to be conducted and dictates the terms under which cleanup must occur.

To learn more about MTCA, view Ecology's Toxics Cleanup Program FAQ document. (pdf 300 kb)

To learn more about the KIP's consent decree, view Ecology's website.

What maintenance activities have been conducted on the site?

The site owner has conducted deferred maintenance on the site, including:

  • Regrade and update to drainage and erosion controls, including installation of three stormwater retention ponds large enough to handle a 100-year storm. Excavated soils were tested and properly disposed of off-site.
  • Replace gravel surfacing across the entire site.
  • Repairs to the existing wharf.
  • Relocation of stockpiled material. Currently some stockpiled soil is being stored on-site awaiting testing and a determination on proper disposal.

All deferred maintenance activities are permitted and monitored by Ecology.

What construction activities are happening at the site? 

KGM built gravity anchors, fluke anchors and other pre-cast concrete components at the KIP. In August 2014, KGM completed construction of all 58 anchors needed for the new floating bridge, and completed final construction and placement of all 776 precast roadway deck sections in August 2015.

Components from the old floating bridge, such as barriers and girders, were dismantled on barges and on the old bridge's pontoons throughout 2016. Once dismantled, the materials were floated to Kenmore by barge and hauled away from the industrial park by truck. This was part of the bridge's decommissioning process.

What activities are taking place in the Kenmore Navigation Channel?

Immediately adjacent to the KIP site is the federally managed Kenmore Navigation Channel. Tugboats and barges are being used by KGM to transport project materials, including anchors and precast roadway deck sections, to the floating bridge site.

How deep is the navigation channel?

As part of their best management practices (BMPs), KGM has conducted two surveys of the navigation channel depths to verify adequate clearance for the operation of project tugboats and barges within the channel. To date, KGM has conducted two of these depth or bathymetry surveys, in May 2012 and January 2013. Please note, the depths on these charts can easily be compared as the data has been standardized to take into account differences in lake and tidal levels.

The results of these surveys indicate that channel conditions remain adequate for use by all project vessels. Additionally, the channel depths in the overlapping survey areas appear to be unchanged between the two survey dates.

KGM primarily uses two tugboats to support project activities in Kenmore. The maximum clearance needed for the KGM vessels used in the channel is 11 feet. From the bathymetry surveys conducted by KGM and documented channel dimensions from the U.S. Army Corps of Engineers, depths in the Kenmore Navigation Channel are more than adequate for the safe operation of these tugboats.

Where barges are loaded at the wharf near the KIP site, channel depths are at their deepest approaching 20 feet deep. Farther into the lake as the tugboats head towards the floating bridge site, depths in the channel remain well within safe operating parameters, generally ranging from 14-17 feet deep.

Where can you find more information?

WSDOT and KGM are working with a number of agencies to ensure the work in Kenmore is conducted safely for residents, workers and the environment. Together, we have worked with these agencies to develop a key questions and answers document (pdf 300 kb) to help answer some of the common questions we have received recently.

You can find information about the KIP site on the following websites.