I-405, I-5, SR 20 closures for construction

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  I-405 will have overnight lane closures from Sept. 3-4 on southbound lanes“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-405 will have overnight lane closures from Aug. 28-31 on northbound lanesNo usable supporting receipt — unverified.
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  I-5 will have nightly lane reductions near Alger/Lake Samish Road (exit 240) from Aug. 31-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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  I-5 will have nightly lane reductions north of North Lake Samish (exit 246) from Aug. 30-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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  State Route 20 will have alternating traffic with flaggers from Swin Slough Bridge to Laconner Whitney Road/Bay View Road starting Aug. 21“020: Daily (except Saturday, Sunday) beginning Aug. 21 until further notice: State Route 20 traffic will alternate with flaggers from the Swin Slough Bridge (milepost 50) to Laconner Whitney Road/Bay View Road (milepost 53) for city Anacortes utilities work.”
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  WSDOT states the I-5 fish passage construction project will continue until 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 ”
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  SR 4 will have single-lane closures weekdays from Aug. 17-Sept. 11 for gas main work“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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  Drivers are advised to slow down and watch for flaggers in work zones“Slow down, stay focused and watch for flaggers direction through the work zone.”
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  The affected routes include major highways connecting Pullman to other communitiesNo usable supporting receipt — unverified.
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  The I-5 corridor is a key transportation route for commuters and freightNo usable supporting receipt — unverified.
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  WSDOT advises drivers to allow extra travel time during the closuresNo usable supporting receipt — unverified.