Infrastructure

I-405, I-90 Work Scheduled for Mid-August

Sunday, August 2, 2026

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The Washington State Department of Transportation (WSDOT) announced several highway construction and closure projects effective mid-August. The most significant is a full closure of northbound I-405 from Northeast Sunset Boulevard to Coal Creek Parkway Southeast, scheduled from 11:30 p.m. Friday, August 7 until 4 a.m. Monday, August 10.

Other closures include a nightly I-90 off-ramp closure from 8 p.m. to 6 a.m. on July 31 and August 1, a two-lane closure on I-90 between Eighth Avenue South and the floating bridge from 8 p.m. Tuesday, August 4 to 3 a.m. Wednesday, August 5, and lane closures on State Route 522 and State Route 526 for maintenance work. WSDOT will provide signed detours for most closures.

Drivers should plan for delays during these work periods. WSDOT's website will provide real-time updates on construction projects.

📄 Source: WSDOT — Highway Construction & Closures — https://wsdot.wa.gov/travel/road-construction

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The Washington State Department of Transportation (WSDOT) announced several highway construction and closure projects effective mid-August.“WSDOT statewide highway construction and road closure updates — 8/1/2026:”
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The most significant project is a full closure of northbound I-405 from Northeast Sunset Boulevard to Coal Creek Parkway Southeast.No usable supporting receipt — unverified.
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The full closure of northbound I-405 is scheduled from 11:30 p.m. Friday, August 7 until 4 a.m. Monday, August 10.“405: All lanes of northbound I-405 from North Southport Drive / Northeast Sunset Boulevard to Coal Creek Parkway Southeast will be fully closed day and night, 11:30 p.m. Friday, Aug. 7 – 4 a.m. Monday, Aug. 10. A signed detour will be in place.”
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There is a nightly I-90 off-ramp closure from 8 p.m. to 6 a.m. on July 31 and August 1.“090: The eastbound I-90 off-ramp to Snoqualmie Pkwy and the westbound I-90 off-ramp to westbound SR 18 will be closed nightly July 31 and Aug. 1 from 8 p.m. to 6 a.m. so crews can install permanent striping on SR 18.”
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There is a two-lane closure on I-90 between Eighth Avenue South and the floating bridge from 8 p.m. Tuesday, August 4 to 3 a.m. Wednesday, August 5.“090: From 8 p.m. Tuesday, Aug. 4 to 3 a.m. Wednesday, Aug. 5, two lanes of Interstate 90 will close in both directions between Eighth Avenue South (milepost 2) and the floating bridge (milepost 4) for maintenance.”
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There are lane closures on State Route 522 and State Route 526 for maintenance work.“522: From 8 p.m. Wednesday, Aug. 5 to 3 a.m. Thursday, Aug. 6, the right lane of northbound State Route 522 from State Route 202/132nd Avenue to the State Route 9 overpass (milepost 12-13) will close for maintenance.”
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WSDOT will provide signed detours for most closures.No usable supporting receipt — unverified.
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Drivers should plan for delays during these work periods.No usable supporting receipt — unverified.
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WSDOT's website will provide real-time updates on construction projects.No usable supporting receipt — unverified.