July 10, 2026 | View as webpage

Celebrating 40 Years of Connecting People and Places

Washington County’s Major Streets Transportation Improvement Program (MSTIP) is celebrating a huge milestone this year — 40 years of connecting people and places. 

Since kicking off in the neon bright 1980s (back when cassette tapes ruled and Back to the Future made us all dream of hoverboards), MSTIP has delivered more than 160 transportation projects and invested over $1.35 billion in community improvements.

Over the last four decades, you’ve likely traveled MSTIP projects without even knowing it.


Major projects have included: 

• Major revamp of Cornelius Pass Road 
• Multi-phase improvements along Walker Road 
• Two generations of improvements to Tualatin-Sherwood Road
• Safety and traffic flow upgrades on Farmington Road   

This summer, we’re celebrating MSTIP40, you’ll find us at community festivals and family-friendly gatherings across Washington County.

Help Us Celebrate at ¡Viva Tualatin!

Where the MSTIP40 fun begins! Pick up your MSTIP40 BINGO card, meet our team, and enjoy live entertainment, cultural performances, and food vendors offering a wide variety of cuisines.


Saturday, July 11 | 12-5pm

Tualatin Community Park | Event Website

Slurry Seal Schedule Now Live

Our slurry seal paving schedule for this season is now available. Slurry seal is one of the key treatments used each summer to protect pavement, slow aging, and extend the life of neighborhood streets.

Slurry seal is the second stage of a two‑step process. Crack sealing is completed first to prevent water from getting under the roadway. Slurry seal follows as the final protective layer, which is why some streets appear twice on the schedule.

Crews will begin slurry seal application across the County starting July 20.

Weather, staffing, and material availability may affect timing, so please check the Paving: 2026 Schedule page regularly for updates and newly posted segments.

Tell Us About Your Experience Accessing Transit in Aloha

Cornelius Pass Road Bridge Replacement at Rock Creek

From temporary signal shutdowns to avoid on your lunch break, to major road closures that will change your daily commute. Plus, community events and more!

Don’t be caught by surprise – visit wc-roads.com to find out what’s happening on county roads and streets. 

Clean Water Services' Design & Construction Standards 
Draft Revision Available for Review

Clean Water Services (CWS) is updating its Design & Construction Standards to meet new National Pollutant Discharge Elimination System permit requirements by November 1, 2026.

These standards set requirements for:

• new and redevelopment, construction, and connections to the public sanitary sewer, and stormwater management systems
• erosion control measures
• vegetated corridor protection and enhancement

The updates focus on boosting onsite stormwater retention, improving pollutant removal, and prioritizing green infrastructure.

Want to learn more about development activity in unincorporated Washington County?

Use the tools below to explore current applications, share comments, and see recent land use decisions.

Search 
Applications Under Review

View 
Recent Land Use Decisions