Infrastructure

I-405, I-5 lanes closed for repairs

Tuesday, September 1, 2026

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I-405 and I-5 will have overnight lane closures through Sept. 4 for construction and repairs.

WSDOT announced multiple closures affecting Centralia–Chehalis area highways. I-405 will have southbound lane closures from milepost 12 to Coal Creek Parkway Southeast from 9 p.m. Thursday, Sept. 3, to 5 a.m. Friday, Sept. 4. Northbound I-405 will have lane closures from milepost 11. 5 to 13. 7 from 9:30 p.m. nightly through Sept. 4. I-5 will be reduced to a single lane nightly near Alger/Lake Samish Road (exit 240) for fish passage construction through Sept. 10.

The closures are for pavement repair, utility work, and fish passage construction. Drivers should expect delays and follow detour signs. WSDOT advises slowing down and watching for flaggers in work zones.

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

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I-405 and I-5 will have overnight lane closures through Sept. 4 for construction and repairs“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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WSDOT announced multiple closures affecting Centralia–Chehalis area highwaysNo usable supporting receipt — unverified.
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I-405 will have southbound lane closures 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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The southbound lane closures on I-405 will be from 9 p.m. Thursday, Sept. 3, to 5 a.m. Friday, Sept. 4“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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Northbound I-405 will have lane closures 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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The northbound lane closures on I-405 will be from 9:30 p.m. nightly through Sept. 4No usable supporting receipt — unverified.
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I-5 will be reduced to a single lane nightly near Alger/Lake Samish Road (exit 240)“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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The single lane reduction on I-5 will be for fish passage construction through Sept. 10No usable supporting receipt — unverified.
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The closures are for pavement repair, utility work, and fish passage construction“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. Effective: Aug 31, 2026, 12:00 AM Expected end: Sep 4, 2026, 4:30 AM 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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Drivers should expect delays and follow detour signsNo usable supporting receipt — unverified.
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WSDOT advises slowing down and watching for flaggers in work zones“Slow down, stay focused and watch for flaggers direction through the work zone.”