Infrastructure

I-405, I-5, and SR 20 Closures Continue Through Sept. 4

Wednesday, September 2, 2026

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Multiple Washington State Department of Transportation (WSDOT) projects will continue lane closures and detours on Aberdeen-area highways through Friday, Sept. 4, 2026.

I-405 will see overnight closures of up to two southbound lanes from milepost 12 to Coal Creek Parkway Southeast, and up to four northbound lanes from milepost 11.5 to 13.7, each nightly from 9 p.m. to 5 a.m. I-5 will have single-lane reductions nightly from 8 p.m. to 5 a.m. near Alger/Lake Samish Road (exit 240) for fish passage construction. State Route 20 will alternate traffic with flaggers daily from Swin Slough Bridge to Laconner Whitney Road/Bay View Road for city utility work.

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

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Multiple Washington State Department of Transportation (WSDOT) projects will continue lane closures and detours on Aberdeen-area highways through Friday, Sept. 4, 2026No usable supporting receipt — unverified.
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I-405 will see overnight closures of up to two southbound lanes from milepost 12 to 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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I-405 will see overnight closures of up to four northbound lanes from milepost 11.5 to 13.7“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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I-405 will see overnight closures each nightly from 9 p.m. to 5 a.m.No usable supporting receipt — unverified.
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I-5 will have single-lane reductions nightly 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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I-5 will have single-lane reductions near Alger/Lake Samish Road (exit 240) 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.”
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State Route 20 will alternate traffic with flaggers daily from Swin Slough Bridge to Laconner Whitney Road/Bay View Road“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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State Route 20 will alternate traffic with flaggers daily for city utility work“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.”