Infrastructure

I-405 and SR-20 closures impact Tacoma commuters

Saturday, August 29, 2026

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I-405 will see multiple overnight closures starting Friday, Aug. 28, including southbound lanes from milepost 14. 25 to 12. 5 and northbound lanes from Northeast 85th Street to Northeast 100th Street. The northbound closure will last until Aug. 31, while the southbound closure is a single night.

State Route 20 will alternate traffic daily (except weekends) from Swin Slough Bridge to Laconner Whitney Road/Bay View Road for utility work starting Aug. 21. SR-124 will be closed from Bolles Road to Coppei Ave in Waitsburg from Aug. 24 until Sept. 18 for environmental remediation, with detours using Bolles Road and Main Street.

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

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I-405 will see multiple overnight closures starting Friday, Aug. 28“405: Up to four lanes of southbound I-405 from milepost 14.25 to milepost 12.5 will be closed overnight, 10 p.m. Friday, Aug. 28 – 8 a.m. Saturday, Aug. 29.”
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Southbound lanes from milepost 14.25 to 12.5 will be closed“405: Up to four lanes of southbound I-405 from milepost 14.25 to milepost 12.5 will be closed overnight, 10 p.m. Friday, Aug. 28 – 8 a.m. Saturday, Aug. 29.”
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Northbound lanes from Northeast 85th Street to Northeast 100th Street will be closed“405: Up to three lanes of northbound I-405 will close from the Northeast 85th Street on-ramp to Northeast 100th Street from 11 p.m. Friday Aug. 28 to 5 a.m. Monday, Aug. 31. A signed detour will be in place.”
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The northbound closure will last until Aug. 31No usable supporting receipt — unverified.
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The southbound closure is a single nightNo usable supporting receipt — unverified.
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State Route 20 will alternate traffic daily (except weekends) 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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The utility work will start on Aug. 21“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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SR-124 will be closed from Bolles Road to Coppei Ave in Waitsburg“124: Beginning Monday, August 24 at 10 a.m., until September 18. Both directions SR-124 from Bolles Road (milepost 41) to Coppei Ave (milepost 45) in Waitsburg will be closed due to environmental remediation work. Traffic is advised to follow posted detour routes using Bolles road and Main Street. City roads will remain open to local traffic.”
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The closure will last from Aug. 24 until Sept. 18No usable supporting receipt — unverified.
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Environmental remediation is the reason for the closureNo usable supporting receipt — unverified.