Louis Thompson Road Tightline Project

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What's happening now

  • Thank you to everyone that took our Design Alternatives Survey. We will be posting a summary of the results soon.
  • Thank you to everyone who attended our May 5 Virtual Public Meeting. If you were not able to make it, you can view the presentation here. You can also view a recording of the presentation and Q&A below.

Project Background

Louis Thompson Road is a vital connection route serving residents of Sammamish and surrounding communities. Historically, the corridor has been impacted by uncontrolled stormwater runoff. The City's project team is designing improvements to Louis Thompson Road from 210th Pl SE to Eastlake Sammamish Parkway NE that will upgrade the existing stormwater conveyance, culvert, and ditch systems in the area and alleviate the flooding, erosion, and landslide issues. The Project will also examine the possibility for adding non-motorized improvements such as sidewalks along the examined segment of the corridor.

Project Needs and Goals

  • Uncontrolled stormwater runoff from the existing roadway and surrounding private properties results in erosion of the existing ditches and at culvert outfalls. Upgrades in the stormwater collection and conveyance system will be implemented to improve conditions and reduce the frequency of flooding events, erosion, and possibility of landslides.
  • The corridor does not currently include any sidewalks, bike lanes, or other non-motorized improvements. While the project’s primary goal is to address the stormwater runoff issues, the City is also considering additional roadway improvements, such as sidewalks, bike lanes, and other non-motorized improvements to add a link for the public between the adjacent neighborhoods and Lake Sammamish.
  • These improvements will be coupled with the City’s commitment to protecting environmentally sensitive areas, such as stream crossings and wetlands. The City will work with the community and appropriate agencies to ensure that roadway improvements are made without negatively impacting natural areas and areas which serve as important habitat for fish and wildlife.

Project Area Today

Louis Thompson Road is a two-lane road with narrow shoulders and open ditches without sidewalks, landscape buffers, or designated bike lanes. The adjacent hillsides and creek systems result in periods of uncontrolled stormwater runoff that causes flooding, erosion, and landslide issues.

Outreach Strategies and Community Engagement

  • The City is planning to engage the public throughout the design process to gather community input on proposed improvements and build trusting relationships with stakeholders.
  • The City is committed to a clear and transparent design process to ensure the final design reflects the preferences of the community and meets their current and future needs.
  • The City's project team is available to meet virtually with interested community organizations, schools, businesses, property owners, and residents to share more about the project and better understand concerns, priorities for design, and how they would like to communicate with the City and share input throughout the project.

The health and safety of the greater Sammamish community will be the forefront priority when planning and executing outreach related to this project. The project team expects to prioritize virtual and digital engagement opportunities for the foreseeable future.


What's happening now

  • Thank you to everyone that took our Design Alternatives Survey. We will be posting a summary of the results soon.
  • Thank you to everyone who attended our May 5 Virtual Public Meeting. If you were not able to make it, you can view the presentation here. You can also view a recording of the presentation and Q&A below.

Project Background

Louis Thompson Road is a vital connection route serving residents of Sammamish and surrounding communities. Historically, the corridor has been impacted by uncontrolled stormwater runoff. The City's project team is designing improvements to Louis Thompson Road from 210th Pl SE to Eastlake Sammamish Parkway NE that will upgrade the existing stormwater conveyance, culvert, and ditch systems in the area and alleviate the flooding, erosion, and landslide issues. The Project will also examine the possibility for adding non-motorized improvements such as sidewalks along the examined segment of the corridor.

Project Needs and Goals

  • Uncontrolled stormwater runoff from the existing roadway and surrounding private properties results in erosion of the existing ditches and at culvert outfalls. Upgrades in the stormwater collection and conveyance system will be implemented to improve conditions and reduce the frequency of flooding events, erosion, and possibility of landslides.
  • The corridor does not currently include any sidewalks, bike lanes, or other non-motorized improvements. While the project’s primary goal is to address the stormwater runoff issues, the City is also considering additional roadway improvements, such as sidewalks, bike lanes, and other non-motorized improvements to add a link for the public between the adjacent neighborhoods and Lake Sammamish.
  • These improvements will be coupled with the City’s commitment to protecting environmentally sensitive areas, such as stream crossings and wetlands. The City will work with the community and appropriate agencies to ensure that roadway improvements are made without negatively impacting natural areas and areas which serve as important habitat for fish and wildlife.

Project Area Today

Louis Thompson Road is a two-lane road with narrow shoulders and open ditches without sidewalks, landscape buffers, or designated bike lanes. The adjacent hillsides and creek systems result in periods of uncontrolled stormwater runoff that causes flooding, erosion, and landslide issues.

Outreach Strategies and Community Engagement

  • The City is planning to engage the public throughout the design process to gather community input on proposed improvements and build trusting relationships with stakeholders.
  • The City is committed to a clear and transparent design process to ensure the final design reflects the preferences of the community and meets their current and future needs.
  • The City's project team is available to meet virtually with interested community organizations, schools, businesses, property owners, and residents to share more about the project and better understand concerns, priorities for design, and how they would like to communicate with the City and share input throughout the project.

The health and safety of the greater Sammamish community will be the forefront priority when planning and executing outreach related to this project. The project team expects to prioritize virtual and digital engagement opportunities for the foreseeable future.

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Your experiences with Louis Thompson Road

4 months

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Page last updated: 16 May 2022, 12:52 PM