Infrastructure

I-405, I-5 lanes closed for construction

Monday, August 31, 2026

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Starting Thursday night, Sept. 3, up to two lanes of southbound I-405 will close from milepost 12 to Coal Creek Parkway Southeast until 5 a.m. Friday, Sept. 4. The closure affects the Tri-Cities area near the 405 and I-405 interchange.

I-5 will see reduced lanes nightly from Aug. 31 to Sept. 4 near Alger/Lake Samish Road (exit 240) for fish passage construction. Northbound I-5 will also close its left lane nightly from Aug. 30 to Sept. 4 north of North Lake Samish (exit 246). These closures are part of ongoing projects to improve infrastructure and support environmental initiatives.

The closures will impact daily commutes and require drivers to plan ahead. WSDOT advises drivers to allow extra time and follow detour signs. Construction on I-5 fish passage projects is expected to continue through Sept. 10.

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

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Starting Thursday night, Sept. 3, up to two lanes of southbound I-405 will close“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 closure starts 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 closure will end until 5 a.m. Friday, Sept. 4No usable supporting receipt — unverified.
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The closure affects the Tri-Cities area near the 405 and I-405 interchangeNo usable supporting receipt — unverified.
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I-5 will see reduced lanes nightly from Aug. 31 to Sept. 4“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 reduced lanes are 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 reduced lanes are for fish passage constructionNo usable supporting receipt — unverified.
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Northbound I-5 will also close its left lane nightly from Aug. 30 to Sept. 4“005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction.”
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The closure is north of North Lake Samish (exit 246)“005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) for fish passage construction.”
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These closures are part of ongoing projects to improve infrastructureNo usable supporting receipt — unverified.
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These closures are part of projects to support environmental initiativesNo usable supporting receipt — unverified.
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The closures will impact daily commutesNo usable supporting receipt — unverified.
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The closures require drivers to plan aheadNo usable supporting receipt — unverified.
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WSDOT advises drivers to allow extra timeNo usable supporting receipt — unverified.
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WSDOT advises drivers to follow detour signsNo usable supporting receipt — unverified.
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Construction on I-5 fish passage projects is expected to continue 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. 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 005: The left lane of northbound I-5 will close from 8 p.m. to 5 a.m. nightly Sunday, Aug. 30, through Friday morning, Sept. 4, north of North Lake Samish (exit 246) 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, 12:49 PM Expected end: Sep 4, 2026, 5:00 AM ”