Status

As of May 18, 2018
Phase: Design 

The Interchange Project is one of the projects resulting from the 145th Street Multimodal Corridor Study that the City of Shoreline conducted in 2015-2016. The purpose of the study was to evaluate current conditions for all users while considering transportation demands that will be the result of a future light rail station at approximately 145th Street and I-5.

The interchange at 145th Street and I-5 greatly influences the function of the entire corridor. In order to keep people and goods moving efficiently through this corridor and to the future station, several improvements are being designed.

Design Elements

The City has been working closely with Washington State Department of Transportation (WSDOT) staff in determining what types of improvements can be made to existing infrastructure without triggering expensive seismic retrogrades. It was determined that the bridge deck (over I-5) could be reconfigured to accommodate six lanes. With this information, the following are the main components to be considered in design:

  • Reconfigure existing bridge deck to six lanes to allow for more left-turn storage to improve east-west traffic flow, removing non-motorized access (pedestrians/bicycle).
  • Build a new separate non-motorized bridge adjacent to current bridge.
  • Extend non-motorized connection to light rail station.
  • Install new button hook ramp for eastbound 145th Street to northbound I-5.
Interchange Concept
 Image of interchange improvement concept

Next Steps

The design and environmental phase is estimated to cost $4.5 million, of which $3.89 million is funded by a federal grant. Overall costs to complete the project are currently estimated at approximately $21.5 million and the City continues to pursue funding.

The City has hired H. W. Lochner, Inc. as the design consultant for the Interchange Project.

Citizens are invited to learn more about the project at our upcoming open house scheduled for Summer of 2018.  Date, time and location have yet to be determined.

The City will be creating a Citizen Advisory Task Force to act as liaison with local neighborhoods to help keep current information about the 145th Street corridor available.

Background

The City of Shoreline conducted the 145th Street Multimodal Corridor Study in 2015-2016 to evaluate current conditions for all users while considering transportation demands that will be the result of a future light rail station at approximately 145th Street and I-5. Through an extensive public process, the City tailored the improvements to maximize benefit while keeping community impacts to a minimum.

As a result of this study, Shoreline has received federal funding to complete design on two sections of the corridor, this Interchange Project and the portion of the 145th Street corridor from Aurora Ave (SR-99) to I-5. Both of these projects are now being designed. A third section of the corridor from I-5 east to Bothell/Lake City Way is a part of Sound Transit 3 that was approved in November 2016. Sound Transit will be addressing improvements on this portion of 145th Street for Bus Rapid Transit (BRT) service, working closely with the City on public outreach.