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  • Patricia Michaud
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    Seattle, WA 98134

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Lake Washington Congestion Management



The Lake Washington Congestion Management Program is a series of projects to help address congestion on I-90 and SR 520 in the Seattle area:

Map of projects funded by the Urban Partnership Agreement.
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The Lake Washington Congestion Management projects reduce congestion along the SR 520 corridor across Lake Washington and help fund the replacement of the SR 520 floating bridge.

About the Lake Washington Congestion Management Program

The Lake Washington Urban Partnership includes a series of projects to help address congestion and increase safety on SR 520 in the Seattle area. These projects are designed to work together to improve traffic flow within the SR 520 corridor by implementing tolling, transit, technology (Smarter Highways), and transportation demand management (TDM e.g. carpool, vanpool and telework) programs. In 2007, the Federal Highway Administration awarded a $154.5 million-dollar grant to support this effort via a partnership between the Washington State Department of Transportation, King County Metro and Puget Sound Regional Council.

Project Benefits

  • Tolling, technology, transit and transportation demand management/telework projects address congestion on SR 520 in a comprehensive way.
  • Federal grants provide an additional funding source to help pay for transportation system improvents, including a SR 520 bridge replacement.
  • Electronic tolling, transit and Smarter Highways tools improve highway safety by reducing collisions.
  • More real-time traffic information helps drivers avoid backups and make informed travel decisions.


Project Timeline

  • Spring 2007 - WSDOT, PSRC and King County submited an Urban Partnership Agreement (UPA) grant application.
  • Summer 2007 - Federal Highway Administration awarded UPA grant.
  • Summer 2008/Spring 2009 - WSDOT conducted environmental process for proposal to toll existing SR 520 bridge.
  • Spring 2009 - Legislature approved tolling the SR 520 bridge.
  • Spring 2010 - Launch of public education and outreach campaign for tolling on SR 520 and comprehensive ridematching/TDM technology platform (RideshareOnline, Totem Lake Green Trips, etc.).
  • Fall 2010 - King County Metro launched new transit trips and other service improvements.
  • Fall 2010/Spring 2011 - Smarter Highway signs activated on SR 520 and I-90.
  • Winter 2011 -  New Good To Go! customer service centers opened in Seattle and Bellevue.
  • Spring 2011 - King County Metro conducted campaign to encourage people to explore their transportation options and offered additional carpool and vanpool incentives. Additional transit capacity is added to the corridor.Telework program expanded from downtown Seattle and Bellevue to entire county. Ridematch/TDM platform upgrades.
  • December 2011 - Tolling started on the SR 520 bridge.

Financial Information

Federal funding via the UPA provides:

(variable tolling of existing SR 520 bridge)
$42.4 million
(active traffic management)
$43.7 million
(new buses and park and rides)
$41 million
(builds on existing programs)
Ferry Projects
(throughout the Puget Sound)
$27 million
Total financial benefit $154 million in federal grants.