Infrastructure

I-405, I-5 Work Scheduled for Week of Sept. 3

Friday, August 28, 2026

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I-405 will have overnight closures on southbound lanes from milepost 12 to Coal Creek Parkway Southeast from 9 p.m. Thursday, Sept. 3, to 5 a.m. Friday, Sept. 4, according to WSDOT. Northbound I-405 will also close from Northeast 70th Place to Northeast 85th Street from 11 p.m. Friday, Aug. 28, to 5 a.m. Monday, Aug. 31.

I-5 will have single-lane reductions nightly from 8 p.m. to 5 a.m. Monday, Aug. 31, through Friday, Sept. 4, near Alger/Lake Samish Road (exit 240) for fish passage construction. A separate I-5 left lane closure will run nightly Sunday, Aug. 30, through Friday, Sept. 4, north of North Lake Samish (exit 246).

The I-5 fish passage project, detailed on the WSDOT website, is expected to continue through September 10 for the Alger/Lake Samish section and until Sept. 4 for the North Lake Samish section.

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

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I-405 will have overnight closures on 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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The overnight closures on I-405 southbound lanes will occur 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 also close from Northeast 70th Place to Northeast 85th Street“405: All lanes of northbound I-405 will close from Northeast 70th Place to Northeast 85th Street from 11 p.m. Friday Aug. 28 to 5 a.m. Monday, Aug. 31. A signed detour will be in place. Effective: Aug 21, 2026, 12:00 AM Expected end: Aug 31, 2026, 5:00 AM”
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The Northbound I-405 closure will occur from 11 p.m. Friday, Aug. 28, to 5 a.m. Monday, Aug. 31“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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I-5 will have single-lane reductions nightly from 8 p.m. to 5 a.m. Monday, Aug. 31“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 reductions on I-5 will run through Friday, 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 single-lane reductions on I-5 are 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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A separate I-5 left lane closure will run nightly Sunday, Aug. 30“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 separate I-5 left lane closure will run through Friday, 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 I-5 left lane 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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The I-5 fish passage project is detailed on the WSDOT website“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>.”
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The I-5 fish passage project is expected to continue through September 10 for the Alger/Lake Samish section“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”
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The I-5 fish passage project is expected to continue until Sept. 4 for the North Lake Samish section“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.”