Road Projects for the Week of September 17 - 23

Sidewalk Curb Ramp Reconstruction

The City of Sammamish is working to implement its ADA Transition Plan. Sidewalk ramps in high pedestrian use areas and on streets scheduled for resurfacing next year are being reconstructed to improve accessibility. Below is more information on specific locations.

The hours of work are 7:00 a.m. - 3:00 p.m. Due to the nature of this work, the sidewalks along the area of work will be closed and pedestrian detour routes will be provided and indicated with signage. During certain portions of this work, the road will be reduced to one lane of traffic. Reader boards are posted around areas of work to alert drivers and pedestrians. Pedestrians should expect delays and plan their routes accordingly. Drivers should use caution and expect minor delays.

228th Avenue SE from Issaquah Pine Lake Road SE to SE 24th Street

Work in this location will occur between August and October. The work crew will be staggering work at intersections to keep pedestrian pathways open.

The specific areas of work are as follows:

  • Eastbound SE 24th St, concluding at Audubon Park Dr SE
  • The entrance to Discovery Elementary School
  • The intersection of 228th Ave SE and SE 24th St
  • Southbound 228th Ave SE along Pine Lake Park
  • The intersection of 228th and Issaquah-Pine Lake Rd SE

Below is a map with the specific areas of work indicated in green.

Klahanie Drive SE from SE Issaquah Fall City Road to 249th Avenue SE, and

247th Place SE-246th Avenue SE-SE 43rd Place-244th Place SE from Issaquah Pine Lake Road SE to SE Klahanie Boulevard.

Work on these streets is scheduled to last through December. The work crew will be staggering the construction to minimize impacts to pedestrian routes. Below is a map with the specific areas of work indicated in green

East Lake Sammamish Trail South Segment B Stage 2 Construction

This is a King County Trail Project

The King County East Lake Sammamish Trail (ELST) South Segment B Phase 2 will begin construction in Spring 2022. All private property owners adjacent to the trail will be able to access their property during construction with limited exceptions for safety reasons. For example, access may be limited, or neighbors may experience short delays during major material unloading or wall construction along a lane. King County plans to incorporate flaggers/spotters on site on site to help pedestrians safely access their properties during daytime.

  • Project Start Point: Approximately 1,350’ south of the intersection of SE 8th Street / East Lake Sammamish Parkway SE (STA 371+59)
  • Project End Point: Approximately 750’ south of the intersection of NE 16th Street / East Lake Sammamish Parkway SE (STA 468+00)

The last uncompleted ELST section, the 1.9-miles from Pine Lake Creek to Inglewood Hill Road, will be closed for construction beginning in early June 2022 until December 2023.

For additional project information, please visit the project website: You may also contact the project team directly by email at or by calling the project hotline at 1-888-668-4886.

Drilling and Excavating in Pacific Estates Neighborhood

Puget Sound Energy completed the drilling and excavating on NE 22nd St and 228th Ave NE in the Pacific Estates neighborhood for a remediation power cable replacement. Restoration is ongoing.

Puget Sound Energy Natural Gas Project

Crews from Puget Sound Energy and InfraSource will be working to replace portions of the existing underground natural gas main with new, corrosion-resistant plastic pipe.

Gas main work in the Tree Farm Neighborhood is ongoing. Work will take place between the hours of 8:00 a.m. to 4:00 p.m.

The gas main replacement on NE 8th St is complete. Necessary asphalt restoration will begin in September. Work on NE 8th St. will take place Monday through Friday, 8:00 a.m. to 4:00 p.m.

Traffic control flaggers and signs will guide vehicles and pedestrians safely around the project areas and there will be lane closures and revisions as crews move along the project route. The bus stop on NE 8th St will be moved 250 ft. west of its current location. Some street parking will be impacted. “No parking” signs will be placed in the areas prior to work beginning.

Drivers should expect delays and use caution. Impacted streets are NE 8th St, NE 7th Ct, 237th Pl NE, NE 6th Ct, NE 6th St, NE 4th Pl, 238th Ave NE and 239th Ave NE, Sammamish. See maps of work below for more details.

Striping and Thermoplastic Markings Maintenance Work

The City will be performing striping and thermoplastic maintenance work on the city’s arterials throughout the summer to refresh existing fog lines, center lines, and thermoplastic markings. Thermoplastic markings include arrows, stop bars, bike symbols, and other markings in the roadway. The arterials being targeted are shown in the map below. This type of work requires dry road pavement so dry weather days are being targeted. Drivers should expect delays and use caution.

East Lake Sammamish Trail South Segment B Stage 1 Construction

The King County East Lake Sammamish Trail (ELST) South Segment B Phase 1 continues with construction. There will be traffic impacts related to the closure of the gravel surface trail segment which causes the re-routing of cyclists and pedestrians to East Lake Sammamish Parkway (ELSP). Additionally, there will be construction traffic on ELSP.

  • Project Start Point: Intersection of SE 33rd / East Lake Sammamish Shore Lane Drive SE
  • Project End Point: Approximately 900' south of the intersection of SE 8th Street / East Lake Sammamish Parkway SE

New School Zone Flashers on Issaquah - Pine Lake Road

The city has installed three new school zone flashing signs on Issaquah-Pine Lake Road near Cedar Trails Elementary to alert drivers of walking students and the reduced speed of 20mph during drop off and pick up times. The exhibit below shows their locations. Drivers should slow down and use caution when these signs are flashing in the mornings and afternoons.

Changes to SE 32nd and 244th Ave SE Intersection

The city changed the intersection of SE 32nd and 244th Ave SE into an all-way stop control due to traffic concurrency issues. New stop signs and stop bars were placed on the approach legs of SE 32nd, in addition to the existing stop sign on 244th. This change took place the week of August 15th and advance warning message signs are in place. Drivers should slow down use caution with this new traffic control change.

Notices for construction activity outside of the City of Sammamish:

Extended overnight lane reductions and ramp closures planned on I-405 in Bellevue - September 15-18

This is a WSDOT project.

Crews working for the Washington State Department of Transportation (WSDOT) will excavate and replace a damaged culvert under I-405 near the 112th Avenue Southeast/Lake Washington Boulevard Southeast (Exit 9) interchange. The repair work will take place from 11:00 p.m., Thursday, Sept. 15, until 9:00 p.m., Sunday, Sept. 18. These closures will cause significant delays throughout the weekend. WSDOT encourages travelers to plan ahead, allow extra time for travel and reschedule discretionary travel if possible.

Lane reduction and ramp closure details Over the four days of work, crews plan to excavate and replace the existing culvert underneath I-405 in three phases. The phased work schedule is:

  • 11 p.m. Thursday, Sept. 15, to 5 p.m. Friday, Sept. 16: the southbound I-405 off-ramp to Exit 9 will be closed. Southbound I-405 will be reduced to two lanes between Coal Creek Parkway Southeast and Exit 9. Drivers wishing to exit southbound I-405 will detour to the Northeast 44th Street (Exit 7) off-ramp.
  • 11 p.m. Friday, Sept. 16 to 10 p.m. Saturday, Sept. 17: all lanes of I-405 at Exit 9 will be closed. Drivers will use the Exit 9 ramps as the detour with flaggers directing traffic.
  • 11 p.m. Saturday, Sept. 17 to 9 p.m. on Sunday, Sept. 18: the Exit 9 on-ramp to northbound I-405 will be closed. All other lanes and ramps will be open.

Detour routes available for full interstate closure Signed detour routes will be in place for the 23-hour full interstate closure. From 11 p.m. Friday, Sept. 16, to 10 p.m. Saturday, Sept. 17, travelers will use the Exit 9 ramps as the detour with flaggers directing traffic. Travelers should expect heavier-than-normal traffic along those routes during the closures. For additional information regarding this closure, visit WSDOT's website, linked here.

Westbound I-90 Closures in September

This is a WSDOT project.

September will bring several major closures on westbound Interstate 90 during the second half of September, including two east of Issaquah and two on the west end of Mercer Island.

During the closures, contractor crews working for the Washington State Department of Transportation will repave a rough section of the interstate where water is seeping onto the roadway. The closures on the west side of Mercer Island will allow crews to replace an expansion joint on the westbound I-90 Homer Hadley Bridge.

The closures east of Issaquah on westbound I-90 will take place:

  • 9:00 p.m. Sunday, Sept. 11 to 5:00 a.m. to Thursday, Sept. 15, reduced to one right lane.
  • 9:00 p.m. Sunday, Sept. 18 5:00 a.m. to Friday, Sept. 23, reduced to one left lane.

The Mercer Island closures on westbound I-90 will be:

  • 10:00 a.m. Friday, Sept. 16 to 5:00 a.m. Monday, Sept. 19, the West Mercer Way on-ramp, the right lane of I-90 and the bike path closed.
  • 2:00 p.m. Thursday, Sept. 22 to 10:00 a.m. Friday, Sept. 23, westbound I-90 reduced to one lane west of 76th Avenue Southeast.
  • 10:00 a.m. Friday, Sept. 23 to 5:00 a.m. Monday, Sept. 26, all lanes of westbound I-90 to the Homer Hadley Bridge closed; one lane of the West Mercer Way on-ramp open.

For more information on these closures, please visit WSDOT's I-90 website, linked here. People who are traveling can get real-time traffic information on their mobile phone with the WSDOT traffic app and by following the WSDOT traffic Twitter feed.

Roundabout at ELSP and SE 43rd St

This is a City of Issaquah project.

The City of Issaquah awarded the contract for the East Lake Sammamish Parkway (ELSP) and SE 43rd Street Roundabout Revisions project to the contractor Northwest Cascade. Construction activities requiring the closure of the roundabout were completed in August.

The City of Issaquah does not plan on closing the intersection again. Remaining work will include some traffic control, but will occur during normal weekday hours. Drivers should expect minor delays and use caution.

More information on this project and the Project Manager's contact information can be found on the City of Issaquah's website, linked here.

Road maintenance on 244th Ave NE near Redmond Fall City Rd, (SR-202)

This is a King County Local Services project.

King County Road Services Division is prioritizing 244th Ave NE near SR-202 to receive snow and ice pre-treatment. Due to a slide occurring in winter 2020, both lanes of 244th Ave NE are narrowed until the impacted support wall can be repaired. The repair of the support wall is expected to begin in Summer 2023. Soil samples yielded unexpected data, which caused the design phase to be extended. King County Road Services Division has a 24/7 Road Helpline - (206) 477-8100. More information on this project can be found, linked here.

Downtown Redmond Link Extension (DRLE) - Sound Transit work

This is a City of Redmond and Sound Transit project.

*This work will begin on April 15, 2022, and last for 4 months.

Crews are scheduled to close the on-ramp from Redmond Way to westbound SR 520 for four months in order to build a new on-ramp. This is part of the Redmond Link Extension construction. Drivers should plan accordingly due to the ramp closure. To stay up-to-date and learn more about this project, please visit the DRLE tab in Cone Zone.

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