Infrastructure

I-405 and I-90 Closures Begin Tonight

Tuesday, September 1, 2026

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I-405 and I-90 will see multiple overnight closures starting Thursday night, Sept. 3, through Friday morning, Sept. 4, according to Washington State Department of Transportation (WSDOT) records. The closures include up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway and up to two lanes of northbound I-405 from milepost 7 to milepost 8. 5. The eastbound I-90 off-ramp to Factoria Boulevard will also close nightly from 9 p.m. Monday, Aug. 31, through 5 a.m. Friday, Sept. 4. A detour will be in place. WSDOT advises drivers to expect delays during these overnight work periods. The closures are part of ongoing construction projects. The I-5 fish passage construction near Alger/Lake Samish Road will continue through Sept. 10, while the I-5 left lane closure north of North Lake Samish will end Sept. 4.

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

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I-405 and I-90 will see multiple overnight closures starting Thursday night, Sept. 3No usable supporting receipt — unverified.
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The closures will continue through Friday morning, Sept. 4“005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction.”
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The closures include up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway“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 closures include up to two lanes of northbound I-405 from milepost 7 to milepost 8“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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The eastbound I-90 off-ramp to Factoria Boulevard will also close nightly from 9 p.m. Monday, Aug. 31“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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The eastbound I-90 off-ramp to Factoria Boulevard will also close nightly through 5 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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A detour will be in place“A signed detour will be in place.”
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WSDOT advises drivers to expect delays during these overnight work periodsNo usable supporting receipt — unverified.
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The closures are part of ongoing construction projects“005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction. More information on the <a href="https://wsdot.wa.gov/construction-planning/search-projects/i-5-tributaries-friday-lake-chuckanut-creeks-fish-passage">project webpage</a>.”
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The I-5 fish passage construction near Alger/Lake Samish Road will continue through Sept. 10“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. More information on the <a href="https://wsdot.wa.gov/construction-planning/search-projects/i-5-tributaries-friday-lake-chuckanut-creeks-fish-passage">project webpage</a>. Effective: Aug 14, 2026, 12:55 PM Expected end: Sep 10, 2026, 5:00 AM”
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The I-5 left lane closure north of North Lake Samish will end Sept. 4“005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction.”