Infrastructure

I-405, I-90, and SR 527 Work Planned for Week of Sept. 1

Tuesday, September 1, 2026

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WSDOT announced overnight closures on I-405, I-90, and SR 527 starting Thursday, Sept. 3, through Friday, Sept. 4. The I-405 southbound lane closure will affect traffic near Coal Creek Parkway Southeast. I-90 eastbound off-ramp to Factoria Boulevard will be closed nightly until Sept. 4.

The I-405 northbound lane work will continue nightly from Aug. 31 through Sept. 4. SR 527 will close one lane overnight on Aug. 31 to Sept. 1. Residents should expect delays during these times and follow detour signs. WSDOT advises drivers to plan ahead for travel through the work zones.

The I-5 fish passage project near exit 240 will continue nightly until Sept. 10, reducing lanes from 8 p.m. to 5 a.m. SR 4 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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WSDOT announced overnight closures on I-405, I-90, and SR 527“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.”
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The overnight closures on I-405, I-90, and SR 527 will start on Thursday, Sept. 3No usable supporting receipt — unverified.
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The overnight closures on I-405, I-90, and SR 527 will end on Friday, Sept. 4No usable supporting receipt — unverified.
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The I-405 southbound lane closure will affect traffic near Coal Creek Parkway Southeast“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 I-90 eastbound off-ramp to Factoria Boulevard will be 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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The I-405 northbound lane work will continue nightly from Aug. 31No usable supporting receipt — unverified.
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The I-405 northbound lane work will continue nightly through Sept. 4No usable supporting receipt — unverified.
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SR 527 will close one lane overnight on Aug. 31“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.”
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SR 527 will close one lane overnight through Sept. 1“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.”
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Residents should expect delays during these timesNo usable supporting receipt — unverified.
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Residents should follow detour signsNo usable supporting receipt — unverified.
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WSDOT advises drivers to plan ahead for travel through the work zonesNo usable supporting receipt — unverified.
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The I-5 fish passage project near exit 240 will continue nightly until 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 fish passage project near exit 240 will reduce lanes from 8 p.m. to 5 a.m.“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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SR 4 will have single-lane closures weekdays 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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SR 4 will have single-lane closures 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.”