Infrastructure

I-405 lane 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, August 28, to 4 a.m. Monday, August 31, per WSDOT. A detour will be in place during the closure. The HOV lane on southbound I-405 will be closed nightly from 9:30 p.m. Monday, August 24, to 5 a.m. Friday, August 28, between SR 181 and I-5. WSDOT states these closures are for construction work. Drivers should expect delays on I-405 and SR 9 during the closures, with alternating one-lane traffic on SR 9 through September 14 for fish passage construction.

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

Source receipts10 of 13 claims supported · 77%

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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 at 11 p.m. Friday, August 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, August 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 4 a.m. Monday, Aug. 31. A signed detour will be in place.”
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A detour will be in place during the closure of Northbound I-405“A signed detour will be in place.”
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The HOV lane on southbound I-405 will be closed 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 on southbound I-405 will start on Monday, August 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 on southbound I-405 will end on Friday, August 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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The HOV lane closure on southbound I-405 is between SR 181 and I-5“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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WSDOT states these closures are for construction workNo usable supporting receipt — unverified.
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Drivers should expect delays on I-405 during the closures“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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Drivers should expect delays on SR 9 during the closuresNo usable supporting receipt — unverified.
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Alternating one-lane traffic will be on SR 9 through September 14No usable supporting receipt — unverified.
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The alternating one-lane traffic on SR 9 is for fish passage construction“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 42 days, until Sept. 14 for fish passage construction. Expect delays in the area.”