180th St SE - Phase I
Description - Completed
Snohomish County’s six-year Transportation Improvement Plan (TIP) identifies projects to improve conditions for pedestrians and motorists, including along 180th St SE near Mill Creek.
The 180th St. SE - Phase I project expanded the three-lane road to five lanes from SR 527 to 23rd Ave SE. As part of this project, the merger of Thompson Creek and Silver Creek was relocated from the north side of 180th St SE to the south side, with each creek flowing beneath 180th St. SE through separate fish-passable culverts.
The project also added sidewalks, bike lanes, curbs, planter strips, and gutters within the project boundaries. Crews rebuilt the traffic signals at 180th St SE and Brook Blvd and created new stormwater detention and treatment facilities.
Construction began in spring 2020 with a temporary month-long pause in work due to a statewide shutdown for COVID during March and April of 2020. The project resumed and was completed by fall 2021 as previously planned.
An environmental review and Checklist was completed in compliance with the State Environmental Policy Act (SEPA) on March 2, 2018 for Phase I of the proposed 180th St. SE road improvement project.
Snohomish County Public Works determined that this project does not have a probable, significant adverse impact on the environment and has issued a Determination of Non-significance (DNS).
Public Comment & Appeal Period
The SEPA comment period regarding this project ended on March 26, 2018.
Snohomish County Public Works held a public meeting on June 27, 2017 to discuss four projects in this area. The projects were the 35th Ave SE - Phase II, 43rd Ave SE/Sunset Rd, 180th St SE Phase I and II, and 196th St SE/Grannis Rd. Staff was available to answer questions, review proposed improvements, and gather feedback on potential designs. The project was also featured during the fall 2019 meeting featuring the 43rd Ave SE/Sunset Rd Improvement Project.
- Newsletter March 2020 (PDF)
- Newsletter/open house invite June 2017 (PDF)
- Meeting displays (PDF), June 2017
- FAQ (PDF), June 2017
- Comment form (PDF), June 2017
- Newsletter May 2012 (PDF)
- Newsletter January 2011 (PDF)
- Newsletter March 2009 (PDF)
Other Projects in the Area
- 180th St SE, Phase II (23rd Ave SE to 35th Ave SE)
- 35th Ave SE, Phase I (180th St SE to Seattle Hill Rd)
- 35th Ave SE, Phase II (SR 524 to 180th St SE)
- 43rd Ave SE/Sunset Rd (SR 524 to 180th St SE)
- 156th St SE (35th Ave SE to the schools)
- 196th St SE/Grannis Rd (22nd Ave SE to 189th Pl SE)
- Seattle Hill Rd (35th Ave SE to 132nd St SE)