9 Construction Projects in Washington State Highways to Avoid

Travelers across Washington State should be aware of several ongoing and upcoming highway construction projects that may impact their journeys in 2025. These projects are part of essential infrastructure upgrades and maintenance, but they bring notable changes to traffic patterns, possible detours, and extended commute times.

Whether you drive daily, plan road trips, or rely on state highways for business, understanding these projects will help you make better travel decisions throughout the year.

1. Revive I-5: Ship Canal Bridge Repairs (Seattle)

Seattle’s Ship Canal Bridge stands as a familiar landmark for commuters, but this summer it’s marked by visible change. Repairs on northbound Interstate 5 introduce weekend lane reductions and bridge deck work, all part of an extensive multi-year overhaul. Many longtime drivers remember previous roadwork, but this phase brings new patterns and a need for extra patience.

Unlike in past years, express lanes remain open at all hours, aiming to manage congestion for those with alternative schedules. Still, travelers should check real-time updates before heading out, since configurations may change weekly. The project is scheduled to continue into 2026 and 2027, so traffic disruptions are not a short-term inconvenience.

For some, the best approach is to plan trips during off-peak hours or explore transit options. Neighboring routes and surface streets may offer relief, but expect heavier volumes there as well throughout construction.

2. SR 99 Weekend Closures (“Conechella” Event)

Nicknamed “Conechella” by locals, the SR 99 weekend closures turn sections of Seattle’s highway into a carefully orchestrated construction zone. This August, drivers will encounter early morning lane reductions on the Aurora Bridge, southbound tunnel closures overnight, and partial northbound daytime closures on the First Avenue Bridge.

The ripple effects extend well beyond Seattle, as associated maintenance and upgrades impact corridors through Kirkland, Renton, Tukwila, Fife, and Auburn. Travelers accustomed to smooth weekend drives may need to reconsider timing or alternate routes. These closures are publicized in advance, but unexpected delays can still surprise even seasoned commuters.

Local news outlets provide detailed closure maps and updates, which can be essential for those with strict schedules. The event’s playful nickname belies the logistical complexity and potential for extended travel times throughout the region.

3. I-90 Snoqualmie Pass East Project

Blasting echoes through the Cascades as the I-90 Snoqualmie Pass East Project progresses between Hyak and Easton. This vital cross-state route sees scheduled closures, controlled explosions, and shifting detours as crews expand and improve the roadway. Weekends and holidays typically bring fewer disruptions, but weekday travel can require flexibility.

Some travelers recall past delays and appreciate the effort to notify the public about blasting schedules in advance, usually by the prior Friday. WSDOT’s real-time travel map and social media provide up-to-date information for those planning long drives across the state. Detours, though temporary, can add time, especially for unfamiliar drivers.

The project’s goal is to ensure safer, more reliable travel through the mountains. Until the work is complete, patience and careful planning are the best strategies for navigating Snoqualmie Pass during construction seasons.

4. SR 167 Completion Project (Pierce County)

Stretching across Pierce County, the SR 167 Completion Project shapes the landscape between Puyallup and Tacoma’s busy port. Construction crews are adding six miles of tolled freeway, which means ongoing changes to traffic lanes and access points. The scale of the work is striking when viewed from above, long corridors of earth moved and bridges emerging from the ground.

The project aims for completion by 2030, so drivers should expect periodic shifts in traffic flow and occasional nighttime closures over several years. Businesses near the corridor may see increased activity and detours as the project advances.

For some, the promise of improved freight movement and new connections is a welcome prospect. In the meantime, checking updates before each trip and watching for detour signage helps minimize delays and confusion along this evolving route.

5. SR 520 Corridor & Floating Bridge Upgrade

SR 520’s floating bridge, a feat of engineering across Lake Washington, is undergoing a transformative upgrade that affects daily commutes and weekend getaways alike. Crews are constructing new HOV ramps, a Portage Bay bridge, and enhanced access to I-5 express lanes. The sight of cranes and work barges has become a regular feature along the lake corridor.

Through 2029, travelers may encounter intermittent lane closures and shifted traffic patterns. Commutes between Seattle and the Eastside can take longer, especially during peak hours or when major construction milestones are underway.

Many appreciate the project’s long-term vision: more efficient travel and safer connections. Until then, digital traffic alerts and WSDOT’s online resources remain valuable for those seeking to avoid bottlenecks and plan efficient trips across the bridge.

6. SR 9 Widening in Snohomish

The SR 9 corridor near downtown Lake Stevens is in the midst of an ambitious $142 million widening and bridge project. Towering cranes and road graders have become part of the local scenery as workers add lanes and a new bridge over the Snohomish River. Drivers who use this route for daily commutes or school runs will notice shifting patterns until project completion.

Scheduled to finish in 2025, the work periodically reduces lanes and requires navigation around construction barriers. Updates from local media and the city’s website help residents plan school drop-offs and errands without getting stuck in unexpected backups.

As the roadway transforms, some longtime residents recall earlier, narrower versions of SR 9. The expanded highway promises improved access, but for now, caution and extra planning are essential for smooth travel in the area.

7. Historic Fairfax Bridge Closure – Near Mount Rainier

The Fairfax Bridge near Mowich Lake once carried visitors through a scenic gateway to Mount Rainier, but safety concerns have led to its closure. Blocked by sturdy barricades, the century-old structure now stands silent above the Carbon River. Generations recall the bridge as a symbol of summer adventures, yet no replacement is expected before 2031.

Without access, drivers must seek alternative routes, which can lengthen travel times for those heading toward the national park’s quieter corners. Local businesses and outdoor enthusiasts feel the impact, especially during peak hiking and camping seasons.

While some bridge closures are temporary, this one marks a significant shift in the area’s transportation landscape. Updates from WSDOT and park services provide guidance for rerouting and exploring other approaches to Mount Rainier’s western side.

8. North Spokane Corridor (US 395) Ongoing Build

The North Spokane Corridor is reshaping how travelers move around Spokane, as new freeway segments open in stages along US 395. Construction zones bring evolving detours and periodic closures, creating a dynamic landscape for commuters and freight vehicles alike. Some residents are excited to see progress after years of debate and planning.

Portions of the corridor are already open, offering glimpses of the future connectivity in store for the region. Full completion is projected for 2030, so disruption will be a part of everyday life along the route for several years.

Neighborhood forums and local news provide regular updates, helping residents prepare for phased changes and new traffic signals. For those navigating Spokane, route planning and flexibility are key until the corridor is fully operational.

9. Statewide Spot Repairs & Preservation Efforts

Across the state, WSDOT is conducting dozens of preservation projects, often unnoticed until drivers encounter an unexpected lane closure or fresh striping. From pavement overlays on I-5 to guardrail upgrades on US 2 and other corridors, these targeted repairs keep highways safe and operational. Crews move frequently, so locations shift throughout spring and summer 2025.

Some travelers have spotted attenuator installations or pothole repairs during nighttime drives. Others appreciate smoother rides after a project’s completion, though the process can cause brief slowdowns. For commercial drivers, advance notice of repairs is especially valued as it impacts delivery schedules.

Regular updates via WSDOT’s travel map and media outlets are crucial for planning. The cumulative effect is safer highways, but a little extra patience is required wherever crews are working this season.