Development

I-405, I-90 Closures Continue Through Week

Thursday, September 3, 2026

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I-405 and I-90 will see overnight lane closures through Friday, Sept. 4, according to WSDOT. The most significant changes include up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast closed overnight Sept. 3-4, and up to two lanes of northbound I-405 from milepost 7 to 8.5 closed nightly until Sept. 4.

Detours will be in place for the eastbound I-90 off-ramp to Factoria Boulevard, which is closed nightly until Sept. 4. WSDOT states these closures are for construction and pavement repair work. Drivers should expect delays during the affected hours.

The I-5 lane reduction near Alger/Lake Samish Road will continue through Sept. 10, and SR 4 work will run through Sept. 11, according to the WSDOT updates.

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

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I-405 and I-90 will see overnight lane closures through Friday, Sept. 4“405: Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast (milepost 10) will be closed overnight, 9 p.m. Thursday, Sept. 3 – 5 a.m. Friday, Sept. 4. 405: Up to two lanes of northbound I-405 from milepost 7 to milepost 8.5 will be closed nightly, 9 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4. 090: The eastbound I-90 off-ramp to Factoria Boulevard will be closed nightly, 9 p.m. Monday, Aug. 31 – 5 a.m. Friday, Sept. 4. A signed detour will be in place.”
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The most significant changes include up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast closed overnight Sept. 3-4“405: Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast (milepost 10) will be closed overnight, 9 p.m. Thursday, Sept. 3 – 5 a.m. Friday, Sept. 4.”
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Up to two lanes of northbound I-405 from milepost 7 to 8.5 closed nightly until Sept. 4“405: Up to two lanes of northbound I-405 from milepost 7 to milepost 8.5 will be closed nightly, 9 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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Detours will be in place for the eastbound I-90 off-ramp to Factoria Boulevard“090: The eastbound I-90 off-ramp to Factoria Boulevard will be closed nightly, 9 p.m. Monday, Aug. 31 – 5 a.m. Friday, Sept. 4. A signed detour will be in place.”
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The eastbound I-90 off-ramp to Factoria Boulevard is closed nightly until Sept. 4“090: The eastbound I-90 off-ramp to Factoria Boulevard will be closed nightly, 9 p.m. Monday, Aug. 31 – 5 a.m. Friday, Sept. 4. A signed detour will be in place.”
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WSDOT states these closures are for construction and pavement repair workNo usable supporting receipt — unverified.
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Drivers should expect delays during the affected hours“Expect delays through the work zone.”
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The I-5 lane reduction near Alger/Lake Samish Road will continue through Sept. 10No usable supporting receipt — unverified.
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SR 4 work will run through Sept. 11“004: Monday, Aug. 17 through Friday, Sept. 11: A single lane in both directions of SR 4 between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) will be closed weekdays from 7:30 a.m. to 5 p.m., for buried gas main line extension work.”