Infrastructure

I-405 and SR 20 closures planned for late August

Wednesday, August 26, 2026

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Starting Friday night, Aug. 28, northbound I-405 will close from Northeast 85th Street to Northeast 100th Street until 4 a.m. Monday, Aug. 31, with a detour in place. The HOV lane on southbound I-405 will close nightly from 9:30 p.m. Monday, Aug. 24, to 5 a.m. Friday, Aug. 28.

SR 20 near Loup Loup Pass will see reduced speeds and alternating traffic Mondays through Thursdays until Aug. 27, and SR 9 near Kalloch Road will be reduced to one lane until Sept. 14 for fish passage construction, with traffic alternating through a bypass road.

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

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Northbound I-405 will close starting Friday night, 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 until 4 a.m. Monday, 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 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 close nightly 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 on 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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SR 20 near Loup Loup Pass will see reduced speeds and alternating traffic Mondays through Thursdays“020: Travelers on SR 20 near Loup Loup Pass will encounter slowdowns and delays while contractor crews perform pavement repairs and paving throughout the pass Mondays to Thursdays from 6 a.m. to 8 p.m. until Aug. 27. Expect alternating, one-lane, two-way traffic, automatic flaggers, temporary rumble strips and reduced speed limits.”
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The reduced speeds and alternating traffic on SR 20 near Loup Loup Pass will continue until Aug. 27“020: Travelers on SR 20 near Loup Loup Pass will encounter slowdowns and delays while contractor crews perform pavement repairs and paving throughout the pass Mondays to Thursdays from 6 a.m. to 8 p.m. until Aug. 27. Expect alternating, one-lane, two-way traffic, automatic flaggers, temporary rumble strips and reduced speed limits.”
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SR 9 near Kalloch Road will be reduced to one lane until Sept. 14“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.”
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Traffic on SR 9 near Kalloch Road will alternate through a bypass road“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.”