43rd Ave SE/Sunset Rd

June 2017 Update

Open House: 35th Ave SE Corridor – Phase II, 43rd Ave SE/Sunset Rd, 180th St SE Phase I and II, and 196th St SE/Grannis Rd (view invite)

Public Works is hosting an open house to discuss these four projects in the unincorporated Mill Creek/Bothell area.
Questions or comments about the open house should be directed to Catherine Breault at 425-388-3053 or catherine.breault@snoco.org.


To provide better access and connectivity between 180th St. SE and State Route (SR) 524 / Maltby Road for motorists and pedestrians, Snohomish County Public Works is planning arterial improvements on 43rd Ave SE from SR 524 to Sunset Road at 180th St. SE. Snohomish County is beginning a design study, which will include evaluating improvements to both the rural and urban portions of the 43rd Ave SE corridor.

The project includes widening 43rd Ave SE from SR 524 to 188th St SE to a 2-lane rural roadway section. A new public road connection (approx. 1400 ft.) between 200th St SE and 196th St SE is also proposed. Additionally, the existing concrete sidewalks between 188th St SE and Jewell Rd / 196th St SE are proposed to be replaced with rural pedestrian facilities.

Urban road improvements are proposed for the portion from 188th St SE to 180th St SE. This includes the addition of a new public road connection (approx. 450 ft.) between 43rd Ave SE and Sunset Rd.


  • 2016-2020: Design, survey, environmental review, right-of-way acquisition
    • The process of developing road projects takes several years. Many factors must be considered, including: location of homes; public right-of-way; stormwater runoff, drainage and water quality; wetlands and buffers; hilly terrain; sight distance; soils; traffic volumes; accident history; vehicle and pedestrian access; location of utilities; and information that residents provide about the area.
  • 2021-2022: Construction

Traffic Impact / Road Closure

Due to the current width of the road south of 188th St SE and rising traffic volumes, Public Works is temporarily closing 43rd Ave SE at 188th St SE to vehicle traffic. The closure goes into effect the week of July 11, 2016 and is proposed to last until improvements are made to 43rd Ave SE. Pedestrian access will still be allowed.

Alternative routes:
  • Residents north of 188th St SE can use 35th Ave SE via 187th Pl SE (a new connection was constructed) to travel south. 
  • Residents at or south of 188th St SE should use 196th St SE or Jewell Rd as an alternative route.
For more information regarding the road closure, read the frequently asked questions (FAQ).
43rd Ave SE detour map


The proposed design, right-of-way, and construction will be funded by the Snohomish County Road Fund. The county will pursue grants and other funding opportunities to help fund the project as the design process proceeds.

Environmental Review

The county will complete an environmental review of the proposed project area in compliance with the State Environmental Policy Act (SEPA).


Other Projects in the Area

In addition to the 43rd Ave. SE project, the county is working on improvements to other nearby corridors including: