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Updated 5/9/25

Louis Thompson Tightline

As part of the Tightline Project, crews will be installing storm drainage structures and pipe along Louis Thompson Road from May 12 – June 20. To keep everyone safe and ensure smooth progress, temporary traffic changes will be in place:

One-Way Traffic Only:

  • Louis Thompson Road will be open only to southbound (uphill) traffic only, 24 hours a day, throughout the construction period.
  • Closure to Northbound (downhill) Traffic: From SE 5th Street to East Lake Sammamish Parkway, Louis Thompson Road will be closed to northbound traffic.
  • Detour signs will be posted, and residents should use alternate routes to travel northbound.

Access and Services Maintained:

    • Southbound traffic will maintain access to all driveways and side streets.
    • Vehicles exiting neighborhoods must travel southbound (uphill).
    • In coordination with the Lake Washington School District, all school bus routes will continue to operate with uphill-only routing.
    • Garbage collection and mail delivery will continue without interruption.

PSE Work

This current gas main replacement is taking place across multiple roadways with traffic control and will probably last at least two more months with restoration to follow shortly after. Drivers and pedestrians should expect some delays and steel sheets covering roadways and sidewalks. Work hours are from 7:30 a.m. – 4:30 p.m. Monday through Friday.


The streets are as follows: 220th Place Northeast at Northeast 16th Street, 224th Place Northeast at Northeast 14th Drive, 220th Place Northeast and 224th Place Northeast, 222nd Place Northeast, Northeast 12th Place, Northeast 12th CT, Northeast 13th CT, Northeast 13th Place and Northeast 15th Street.

Stormwater Pipe Inspection

Crews will inspect and clean stormwater pipes along 212th Avenue Southeast between Southeast 24th Street and Southeast 13th Place. Once work is complete here, crews will begin on Southeast 29th Street between 228th Avenue Southeast and Southeast 226th Avenue Southeast. Work will run from May 12 through May 16. Traffic disruptions will be minimal, with only occasional single-lane closures expected.

2025 Citywide Traffic Counts

The City of Sammamish will collect traffic counts throughout the city from April 28-May 12. Tubes will be placed on main roadways to collect traffic volumes and cameras will be setup at intersections to record vehicle movements. This equipment will not impact traffic, however they may be felt when driving over them. Drivers should also use caution when passing the contractor’s vehicles when stopped on the side of the road to place tubes or check on their equipment. For more information, please see the city’s webpage about the traffic counts program below.

https://www.sammamish.us/government/public-works/traffic-engineering/citywide-traffic-counts/

Ziply Fiber Restoration Work

The Ziply permits are currently suspended by the City of Sammamish. Ziply is still allowed to perform restoration work associated with previous construction activities. Restoration activities include soft surface replacement, asphalt patching, and sidewalk replacement.

 

 

WSDOT Traffic Alerts

Traffic Alert: I-90 Lane Closures

Washington State Department of Transportation (WSDOT) crews are continuing repairs on the Interstate 90 project, which will have congestion impacts, especially during peak travel time. These are a continuation of repairs WSDOT began in summer 2022. While this work is occurring, please plan ahead and allow extra time.

State Route 18 Closures

People who use State Route 18 should expect slight traffic shifts during the daytime commute and intermittent nightly lane reductions. This may be as early as 8 p.m. Mondays through Thursdays, with all lanes reopening by 5 a.m. Flaggers will direct motorists when traffic is reduced to one lane. People should continue to plan extra time for their trips, as contractor crews work to widen the highway and redesign the interchange.

More information can be found here: https://wsdot.wa.gov/construction-planning/search-projects/i-90-sr-18-interchange-improvements