Public Safety

I-405, I-90, SR 9 closures continue through Sept. 4

Friday, September 4, 2026

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Multiple Washington State Department of Transportation (WSDOT) projects will cause overnight lane closures on I-405, I-90, and SR 9 in Vancouver, WA, through early September. The closures include up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast, up to two lanes of northbound I-405 from milepost 7 to 8.5, and the eastbound I-90 off-ramp to Factoria Boulevard.

The closures are scheduled for overnight periods from Thursday, Sept. 3, to Friday, Sept. 4, for the I-405 southbound project, and nightly from Monday, Aug. 31, through Friday, Sept. 4, for other projects. WSDOT states the closures are for construction and repair work, with signed detours provided for affected routes. The projects are expected to end by Sept. 4, 2026, though some projects like SR 9 will continue until Sept. 24.

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

Source receipts8 of 12 claims supported · 67%

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Multiple Washington State Department of Transportation (WSDOT) projects will cause overnight lane closures“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. 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. 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. 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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The lane closures will occur on I-405, I-90, and SR 9 in Vancouver, WANo usable supporting receipt — unverified.
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The closures will last through early SeptemberNo usable supporting receipt — unverified.
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Up to two lanes of southbound I-405 will be closed 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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Up to two lanes of northbound I-405 will be closed from milepost 7 to 8.5“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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The eastbound I-90 off-ramp to Factoria Boulevard will be closed“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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The I-405 southbound project closures are scheduled for overnight periods from Thursday, Sept. 3, to 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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Other projects will have nightly closures from Monday, Aug. 31, through Friday, Sept. 4“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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WSDOT states the closures are for construction and repair workNo usable supporting receipt — unverified.
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Signed detours will be provided for affected routes“A signed detour will be in place.”
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The projects are expected to end by Sept. 4, 2026No usable supporting receipt — unverified.
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Some projects like SR 9 will continue until Sept. 24“009: SR 9 is reduced to a single lane near Kalloch Road (MP 59) with a signal alternating northbound and southbound traffic through a bypass road for 52 days, until Sept. 24 for fish passage construction. Expect delays in the area.”