Public Safety

I-405 and I-90 Closures for Week of Sept. 3

Thursday, September 3, 2026

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Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast will close overnight Thursday, Sept. 3, through Friday, Sept. 4, according to WSDOT.

Northbound I-405 lanes near milepost 7 will close nightly until Sept. 4, and the eastbound I-90 off-ramp to Factoria Boulevard will close nightly until Sept. 4. WSDOT says a signed detour will be in place for the I-90 closure.

These closures are part of ongoing construction projects. WSDOT states the I-405 southbound closure will end at 5 a.m. on Sept. 4, while the other closures end at 4:30 a.m. on Sept. 4.

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

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Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast will close overnight Thursday“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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The closure of Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast will continue through Friday“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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Northbound I-405 lanes near milepost 7 will close nightly until Sept. 4No usable supporting receipt — unverified.
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The eastbound I-90 off-ramp to Factoria Boulevard will close 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.”
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WSDOT says a signed detour will be in place for the I-90 closure“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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These closures are part of ongoing construction projects“005: The northbound and southbound I-5 will be reduced to a single lane from 8 p.m. to 5 a.m. nightly Monday, Aug. 31, through Friday morning, Sept. 4, near Alger/Lake Samish Road (exit 240) for fish passage construction.”
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WSDOT states the I-405 southbound closure will end at 5 a.m. on 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.”
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The other closures end at 4:30 a.m. on Sept. 4No usable supporting receipt — unverified.