Public Safety

I-405, I-90 closures extend through Labor Day

Thursday, September 3, 2026

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WSDOT announced extended closures for I-405, I-90, and SR 20 starting Sept. 2, 2026. The I-405 southbound lane closures between SR 522 and SR 203 will run nightly from 9 p.m. to 5 a.m. through Friday, Sept. 4. Northbound I-405 will see lane closures from milepost 11.5 to 13.7 nightly until Sept. 4 at 4:30 a.m. I-90's eastbound Factoria Boulevard off-ramp will close nightly from 9 p.m. to 5 a.m. through Friday.

SR 20 will alternate traffic with flaggers daily from Swin Slough Bridge to Laconner Whitney Road for Anacortes utility work, beginning Aug. 21. I-5 southbound will have nightly closures from Lacamas Creek to Exit 57 for guardrail repairs until Sept. 4 at 9:30 a.m. SR 9 and SR 547 near George Road will see alternating traffic on Sept. 1 for paving work, weather permitting.

Travelers should expect delays through the work zones. WSDOT advises slowing down and allowing extra time for commutes. The closures are part of routine maintenance and utility projects.

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

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WSDOT announced extended closures for I-405, I-90, and SR 20 starting Sept. 2, 2026No usable supporting receipt — unverified.
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The I-405 southbound lane closures between SR 522 and SR 203 will run nightly from 9 p.m. to 5 a.m.No usable supporting receipt — unverified.
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The I-435 southbound lane closures between SR 522 and SR 203 will run through Friday, Sept. 4No usable supporting receipt — unverified.
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Northbound I-405 will see lane closures from milepost 11.5 to 13.7 nightly“405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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Northbound I-405 will see lane closures until Sept. 4 at 4:30 a.m“405: Up to two lanes of northbound I-405 from milepost 7 to milepost 8.5 will be closed nightly, 9 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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I-90's eastbound Factoria Boulevard off-ramp will close nightly from 9 p.m. to 5 a.m.“090: The eastbound I-90 off-ramp to Factoria Boulevard will be closed nightly, 9 p.m. Monday, Aug. 31 – 5 a.m. Friday, Sept. 4. A signed detour will be in place.”
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I-90's eastbound Factoria Boulevard off-ramp will close through Friday“090: The eastbound I-90 off-ramp to Factoria Boulevard will be closed nightly, 9 p.m. Monday, Aug. 31 – 5 a.m. Friday, Sept. 4. A signed detour will be in place.”
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SR 20 will alternate traffic with flaggers daily from Swin Slough Bridge to Laconner Whitney Road“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 20 will alternate traffic with flaggers daily 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 20 will alternate traffic with flaggers daily beginning 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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I-5 southbound will have nightly closures from Lacamas Creek to Exit 57“005: From 6 p.m., Monday, Aug. 31 to 9:30 a.m., Friday, Sept. 4: A single lane of southbound I-5 from Lacamas Creek (milepost 61) to Exit 57 (milepost 56), will close nightly for guardrail repairs.”
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I-5 southbound will have nightly closures for guardrail repairs until Sept. 4 at 9:30 a.m“005: From 6 p.m., Monday, Aug. 31 to 9:30 a.m., Friday, Sept. 4: A single lane of southbound I-5 from Lacamas Creek (milepost 61) to Exit 57 (milepost 56), will close nightly for guardrail repairs.”
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SR 9 and SR 547 near George Road will see alternating traffic on Sept. 1“009: Northbound and southbound traffic will alternate near George Road (milepost 86) from 6 a.m. to 6 p.m. Tuesday, Sept. 1, for paving work near the railroad tracks. Expect delays in the area. This work is part of a project <a href="https://wsdot.wa.gov/construction-planning/search-projects/sr-9-park-road-vicinity-and-sr-547-saar-creek-sumas-river-paving">repaving sections of SR 9 and SR 547</a> in Whatcom County.”
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SR 9 and SR 547 near George Road will see alternating traffic for paving work“009: Northbound and southbound traffic will alternate near George Road (milepost 86) from 6 a.m. to 6 p.m. Tuesday, Sept. 1, for paving work near the railroad tracks. Expect delays in the area. This work is part of a project <a href="https://wsdot.wa.gov/construction-planning/search-projects/sr-9-park-road-vicinity-and-sr-547-saar-creek-sumas-river-paving">repaving sections of SR 9 and SR 547</a> in Whatcom County.”
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SR 9 and SR 547 near George Road will see alternating traffic weather permittingNo usable supporting receipt — unverified.