Infrastructure

I-405 closures extend through Labor Day

Thursday, August 27, 2026

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Northbound I-405 will close from Northeast 85th Street to Northeast 100th Street from 11 p.m. Friday, Aug. 28 through 4 a.m. Monday, Aug. 31, according to WSDOT. A signed detour will be in place during the closure. The HOV lane of southbound I-405 will close nightly from 9:30 p.m. Monday, Aug. 24 to 5 a.m. Friday, Aug. 28, per WSDOT records. Both closures are part of ongoing maintenance and construction projects along the highway. WSDOT's website notes the closures are scheduled to end by Labor Day weekend, with the northbound closure extending through Monday morning.

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

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Northbound I-405 will close from Northeast 85th Street to Northeast 100th Street“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 4 a.m. Monday, Aug. 31. A signed detour will be in place.”
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The closure of Northbound I-405 will start from 11 p.m. Friday, Aug. 28“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 4 a.m. Monday, Aug. 31. A signed detour will be in place.”
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The closure of Northbound I-405 will end at 4 a.m. Monday, Aug. 31No usable supporting receipt — unverified.
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A signed detour will be in place during the closure“A signed detour will be in place.”
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The HOV lane of southbound I-405 will close nightly“405: The HOV lane of southbound I-405 from SR 181 (milepost 1) to I-5 (milepost 0) will be closed nightly, 9:30 p.m. Monday, Aug. 24 – 5 a.m. Friday, Aug. 28.”
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The closure of the HOV lane of southbound I-405 will start from 9:30 p.m. Monday, Aug. 24“405: The HOV lane of southbound I-405 from SR 181 (milepost 1) to I-5 (milepost 0) will be closed nightly, 9:30 p.m. Monday, Aug. 24 – 5 a.m. Friday, Aug. 28.”
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The closure of the HOV lane of southbound I-405 will end at 5 a.m. Friday, Aug. 28“405: The HOV lane of southbound I-405 from SR 181 (milepost 1) to I-5 (milepost 0) will be closed nightly, 9:30 p.m. Monday, Aug. 24 – 5 a.m. Friday, Aug. 28.”
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Both closures are part of ongoing maintenance and construction projects along the highwayNo usable supporting receipt — unverified.
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WSDOT's website notes the closures are scheduled to end by Labor Day weekendNo usable supporting receipt — unverified.
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The northbound closure will extend through Monday morning“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 4 a.m. Monday, Aug. 31. A signed detour will be in place.”