Infrastructure

I-405, I-90 closures for overnight work

Wednesday, September 2, 2026

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Starting Thursday night, Sept. 3, up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway will close overnight until 5 a.m. Friday. Nightly closures will also affect northbound I-405 between mileposts 7 and 8. 5, eastbound I-90 off-ramp to Factoria Boulevard, and northbound I-405 from milepost 11. 5 to 13. 7 through Sept. 4.

WSDOT states these closures are for construction work, with detours in place for the I-90 off-ramp. The I-5 fish passage project near Alger/Lake Samish Road will continue nightly lane reductions until Sept. 10. SR 4 between 50th and 42nd Avenues will have single-lane closures weekdays until Sept. 11 for gas line work.

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

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Starting Thursday night, Sept. 3, up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway will close overnight“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 will continue until 5 a.m. FridayNo usable supporting receipt — unverified.
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Nightly closures will also affect northbound I-405 between mileposts 7 and 8No usable supporting receipt — unverified.
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The closure will affect 5, eastbound I-90 off-ramp to Factoria BoulevardNo usable supporting receipt — unverified.
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Northbound I-405 from milepost 11. 5 to 13. 7 will be affected through Sept. 4“405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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WSDOT states these closures are for construction work“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>.”
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Detours are in place for the I-90 off-ramp“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 I-5 fish passage project near Alger/Lake Samish Road will continue nightly lane reductions until Sept. 10No usable supporting receipt — unverified.
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SR 4 between 50th and 42nd Avenues will have single-lane closures weekdays“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.”
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The single-lane closures on SR 4 will continue until 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.”
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The single-lane closures on SR 4 are for gas line work“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.”