Infrastructure

I-405 and I-5 lane closures scheduled for Sept. 3-4

Monday, August 31, 2026

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WSDOT will close up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast from 9 p.m. Thursday, Sept. 3, to 5 a.m. Friday, Sept. 4. The closure is part of ongoing construction on the highway.

I-5 will also see reduced lanes during overnight hours from Monday, Aug. 31, through Friday, Sept. 4. Northbound I-5 will have a single lane from 8 p.m. to 5 a.m. nightly near Alger/Lake Samish Road (exit 240) for fish passage construction. A similar closure will affect the left lane of northbound I-5 north of North Lake Samish (exit 246) during the same timeframe.

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

Source receipts5 of 8 claims supported · 63%

Legacy automated check: the original source text was not preserved. These earlier verdicts have not passed the current publication checks and may contain errors. Source: original document ↗

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WSDOT will close up to two lanes of southbound I-405 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 is part of ongoing construction on the highway“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 closure 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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I-5 will also see reduced lanes during overnight hours from Monday, Aug. 31, 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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Northbound I-5 will have a single lane from 8 p.m. to 5 a.m. 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 closure is for fish passage constructionNo usable supporting receipt — unverified.
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A similar closure will affect the left lane of northbound I-5 north of North Lake Samish (exit 246)No usable supporting receipt — unverified.
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The closure will occur during the same timeframeNo usable supporting receipt — unverified.