Infrastructure

I-405 lane closures extend through Labor Day

Tuesday, September 1, 2026

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I-405 will have multiple lane closures starting Monday night through Labor Day weekend for construction work and fish passage projects. The most significant closure affects southbound I-405 from milepost 12 to Coal Creek Parkway, scheduled to close overnight Thursday, Sept. 3, until 5 a.m. Friday, Sept. 4.

WSDOT reports four additional overnight closures on I-405 and SR 527, as well as alternating traffic on SR 20 near Anacortes. The I-5 fish passage project near exit 240 will reduce lanes nightly through Sept. 10, while a gas line project on SR 4 will close a single lane weekdays through Sept. 11.

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

Checked against the public record4 of 9 claims · 44%

Every factual claim below was checked against the original public record. Source: original document ↗

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I-405 will have multiple lane closures starting Monday night through Labor Day weekend“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. 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. 405: Up to four lanes of southbound I-405 from milepost 13.4 to milepost 11.4 will be closed nightly, 8 p.m. Monday, Aug. 31 – 5 a.m. Thursday, Sept. 3.”
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Construction work and fish passage projects are the reasons for the lane closures on I-405“null”
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The most significant closure affects southbound I-405 from milepost 12 to Coal Creek Parkway“null”
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The most significant closure is scheduled to close overnight Thursday, Sept. 3“null”
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The most significant closure will remain closed until 5 a.m. Friday, Sept. 4“null”
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WSDOT reports four additional overnight closures on I-405 and SR 527“null”
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There will be alternating traffic on SR 20 near Anacortes“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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The I-5 fish passage project near exit 240 will reduce lanes nightly 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.”
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A gas line project on SR 4 will close a single lane weekdays through 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.”