I-405, I-90 Work Planned for Week of Sept. 3

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  WSDOT has announced multiple highway closures effective late August through early September for construction and maintenance workNo usable supporting receipt — unverified.
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  Starting Thursday, Sept. 3, up to two lanes of southbound I-405 will close overnight from milepost 12 to Coal Creek Parkway until 5 a.m. 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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  Overnight closures will also affect I-90's eastbound Factoria Boulevard off-ramp from Aug. 31 to 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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  I-405's northbound lanes from milepost 11.5 to 13.7 nightly 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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  The closures aim to accommodate infrastructure work including pavement repair, utility upgrades, and fish passage construction“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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  I-5 near Alger/Lake Samish Road (exit 240) will see reduced lanes nightly until Sept. 10 for fish passage construction“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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  WSDOT advises drivers to expect delays and follow detour signs during the work periods“Slow down, stay focused and watch for flaggers direction through the work zone.”
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  Drivers should plan for overnight closures on I-405, I-90, SR 527, and SR 20 through early September“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. 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. 527: The right lane of northbound SR 527 at the I-405 ramps (milepost 2.6 to milepost 2.95) will be closed overnight from 11:59 p.m. Monday, Aug. 31 to 5 a.m. Tuesday, Sept. 1. 020: Daily (except Saturday, Sunday) beginning Aug. 21 until further notice: State Route 20 traffic will alternate with flaggers from the Swin Slough Bridge (milepost 50) to Laconner Whitney Road/Bay View Road (milepost 53) for city Anacortes utilities work.”
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  Detours will be signed, and work zones will require reduced speeds and attention to flaggersNo usable supporting receipt — unverified.