84th St NE and 163rd Ave NE Intersection Improvements

June 2023 Update

Utility relocations for this project are underway and will continue through the end of fall. Occasional single-lane closures are expected as crews work.


To improve traffic flow and reduce the risk of collisions, Snohomish County Public Works is making intersection improvements at 84th St NE and 163rd Ave NE, a block west of State Route 92 near Granite Falls. The two-lane 84th St NE serves as a main connection for drivers traveling between Marysville and Granite Falls. Traffic on 163rd Ave NE is currently controlled by a two-way stop. The county proposes to construct a roundabout at this intersection to improve traffic flow and safety.

Design details include:

  • A 55-foot diameter center island
  • A 15-foot-wide inside truck apron and a 20-foot circulating roadway
  • Outside truck aprons would be added to the NE, NW and SW edges of the circulating lane to accommodate long-combination hauling vehicles
  • The approach lanes would be 12-feet wide with chicanes designed to reduce approach speeds.
  • Shared use concrete sidewalks with a buffer strip to be used by both bicycles and pedestrians in the roundabout
  • The number of lanes would remain the same, but the intersection would be realigned and slightly raised to provide drainage


This project is expected to go to construction in the spring of 2024.


Funding has been secured through a $1.8 million Highway Safety Improvement Program (HSIP) grant. A 10 percent local match from the roads fund is also committed.

Land Disturbing Activity (LDA) Permit

This project was reviewed for compliance with Chapter 30.63A (Drainage) and Chapter 30.63B (Land Disturbing Activity) SCC, as well as other applicable regulations in Title 30 SCC. Public Works will exercise its authority under Rule 5001 (Revised 10/2020).

 A notice of Land Disturbing Activity (LDA) was published on December 13, 2020. A SEPA checklist has been completed. The 21-day comment period ended January 6, 2021. 

Environmental Review

Public Works has completed an environmental review of the proposed project in compliance with the State Environmental Policy Act (SEPA)A notice of Determination of Non-Significance was published on June 4, 2021. The 14-day comment period ended June 18, 2021.

Public Meeting

Snohomish County Public Works hosted a virtual public meeting to update residents on recently completed, current and future projects on the 84th St NE corridor from SR 9 to SR 92. A recording of the meeting can be seen at the link below, along with a Frequently Asked Questions document created from public questions: