Alderwood Mall Parkway Corridor Improvements

Update - May 2023

Snohomish County Public Works has completed environmental review on this project under the State Environmental Policy Act (SEPA), and has published a Determination of Non-Significance (DNS) and Re-Notice of the LDA Permit Application. See details below under the heading SEPA Environmental Review and Land Disturbing Activity (2023).


Snohomish County Public Works proposes to widen Alderwood Mall Parkway from the SR 525 northbound ramps to the 16800 block. The project would widen the road to five lanes, including a center turn lane, raised bike lanes, sidewalks, gutters, curbs, drainage facilities, three fish-passage culverts, and new traffic signals at the SR 525 northbound ramps intersection. Snohomish County is also planning to overlay Alderwood Mall Parkway from 164th St SW south to the Lynnwood city limits at the same time as the widening project. 


  • 2019-2020: Completed field survey, preliminary design and environmental studies
  • 2021-2024: Design, environmental review, right of way acquisitions and utility relocations
  • 2025-2027: Construction scheduled to begin in 2025, subject to permitting

Traffic Impact

Single lane closures will be utilized during construction and business access will be available during the project.


The project cost is estimated at $13 million and will be funded by the Snohomish County Road Fund, Mitigation Funds, and Surface Transportation Program (STP) Funds. In addition, this project has received:

  • Federal Highway Administration - $2.58 million grant
  • Washington State Public Works Board - $3 million loan
  • Washington State Transportation Improvement Board - $4.5 million grant

Land Disturbing Activity (LDA) Permit (2021)

A notice of Land Disturbing Activity (LDA) was published on June 27, 2021. A SEPA checklist was completed. The 21-day comment period ended July 19, 2021. 

SEPA Environmental Review and Land Disturbing Activity (2023)

Land Disturbing Activity (LDA) Permit 

This project will require an LDA permit and this is a Re-Notice of the LDA Permit Application. The 21-day public comment period ended on 5:00 PM PST, June 12, 2023. An earlier Notice of LDA Permit Application was published on June 27, 2021, in The Everett Herald, and a comment period was offered ending on 5:00 PM PST, July 19, 2021. The LDA Permit Application expired on December 27, 2022.  

SEPA Environmental Review

State Environmental Policy Act (SEPA) Decision: Snohomish County Public Works determined that this project does not have a probable, significant adverse impact on the environment and issued a Determination of Non-Significance (DNS) on May 20, 2023. An environmental impact statement (EIS) under RCW 43.21C.030(2)(c) is not required. This decision was made after review of SEPA documents and other information on file with this agency.

Other Documents

Postcard - November 2019 

Public Meeting - October 12, 2022

Snohomish County Public Works held a five project Lynnwood area open house on Oct. 12, 2022. This project was among those featured. Below are documents available at the meeting: