Infrastructure

Walla Walla Highway Closures Planned for Late August

Sunday, August 30, 2026

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WSDOT announced several highway closures in Walla Walla effective late August through early September. Northbound I-405 will close from 11 p.m. Aug. 28 to 5 a.m. Aug. 31, and southbound I-405 will close overnight Sept. 3-4. I-5 will have nightly lane reductions 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).

State Route 20 will have alternating traffic daily (except weekends) from Swin Slough Bridge to Laconner Whitney Road/Bay View Road for Anacortes utility work. SR 4 will have single-lane closures weekdays from 7:30 a.m. to 5 p.m. between 50th and 42nd Avenues through Sept. 11. SR 99 will close the right lane from 8 p.m. Aug. 31 to 5 a.m. Sept. 1 for utility work.

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

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WSDOT announced several highway closures in Walla Walla effective late August through early September.No usable supporting receipt — unverified.
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Northbound I-405 will close from 11 p.m. Aug. 28 to 5 a.m. 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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Southbound I-405 will close overnight Sept. 3-4.“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 have nightly lane reductions from 8 p.m. to 5 a.m. through Sept. 4 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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I-5 will have nightly lane reductions from 8 p.m. to 5 a.m. through Sept. 4 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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State Route 20 will have alternating traffic daily (except weekends) from Swin Slough Bridge to Laconner Whitney Road/Bay View Road for Anacortes utility work.“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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SR 4 will have single-lane closures weekdays from 7:30 a.m. to 5 p.m. between 50th and 42nd Avenues through Sept. 11.“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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SR 99 will close the right lane from 8 p.m. Aug. 31 to 5 a.m. Sept. 1 for utility work.No usable supporting receipt — unverified.