Infrastructure

I-405, I-5, and SR 4 lane closures begin this week

Saturday, August 29, 2026

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Starting Friday night, Aug. 28, up to three lanes of northbound I-405 will close from the Northeast 85th Street on-ramp to Northeast 100th Street until 5 a.m. Monday, Aug. 31. A signed detour will be in place.

State Route 4 will see a single lane closed in both directions between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) weekdays from 7:30 a.m. to 5 p.m. through Friday, Sept. 11, for buried gas main line work. The right lane of State Route 99 will close from 8 p.m. Monday, Aug. 31, to Tuesday, Sept. 1, for utilities work.

I-5 will have single-lane reductions nightly from 8 p.m. to 5 a.m. through Sept. 4 near Alger/Lake Samish Road (exit 240) and north of North Lake Samish (exit 246) for fish passage construction. More details are available on the WSDOT project webpage.

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

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Starting Friday night, Aug. 28, up to three lanes of northbound I-405 will close“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 closure of northbound I-405 will be from the Northeast 85th Street on-ramp to Northeast 100th Street“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 closure of northbound I-405 will last until 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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A signed detour will be in place“A signed detour will be in place.”
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State Route 4 will see a single lane closed in both directions“004: Monday, Aug. 17 through Friday, Sept. 11: A single lane in both directions of SR 4 between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) will be closed weekdays from 7:30 a.m. to 5 p.m., for buried gas main line extension work.”
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The single lane closure on State Route 4 will be between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2)“004: Monday, Aug. 17 through Friday, Sept. 11: A single lane in both directions of SR 4 between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) will be closed weekdays from 7:30 a.m. to 5 p.m., for buried gas main line extension work.”
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The single lane closure on State Route 4 will occur weekdays from 7:30 a.m. to 5 p.m.“004: Monday, Aug. 17 through Friday, Sept. 11: A single lane in both directions of SR 4 between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) will be closed weekdays from 7:30 a.m. to 5 p.m., for buried gas main line extension work.”
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The single lane closure on State Route 4 will last through Friday, Sept. 11No usable supporting receipt — unverified.
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The right lane of State Route 99 will closeNo usable supporting receipt — unverified.
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The closure of the right lane of State Route 99 will be from 8 p.m. Monday, Aug. 31“099: From 8 p.m. Monday, Aug. 31 to Tuesday, Sept. 1, the right lane of State Route 99 from Russell Way/North Manor Way to Gibson Road (milepost 51) will close for utilities work.”
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The closure of the right lane of State Route 99 will end on Tuesday, Sept. 1“099: From 8 p.m. Monday, Aug. 31 to Tuesday, Sept. 1, the right lane of State Route 99 from Russell Way/North Manor Way to Gibson Road (milepost 51) will close for utilities work. Effective: Aug 28, 2026, 10:57 AM Expected end: Sep 1, 2026, 5:00 AM”
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I-5 will have single-lane reductions nightly“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 be 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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The single-lane reductions on I-5 will last through 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 will be 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 reductions on I-5 will be 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 single-lane reductions on I-5 will be for fish passage construction“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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More details are available on the WSDOT project webpage“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>.”