Infrastructure

I-405, SR 9 closures this weekend

Saturday, August 29, 2026

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I-405 will have overnight closures from milepost 14. 25 to 12. 5 southbound and from Northeast 85th Street to 100th Street northbound, starting Friday night, Aug. 28, through Monday morning, Aug. 31. SR 9 will have alternating traffic through a bypass road near Kalloch Road for 42 days until Sept. 14, and alternating traffic Mondays through Thursdays near Mount Vernon Big Lake Road through Sept. 3. The closures are for fish passage construction on SR 9 and highway maintenance on I-405 and SR 599. WSDOT notes delays are expected in affected areas. The SR 9 project webpage provides more details on the fish passage work.

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

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I-405 will have overnight closures from milepost 14.25 to 12.5 southbound“405: Up to four lanes of southbound I-405 from milepost 14.25 to milepost 12.5 will be closed overnight, 10 p.m. Friday, Aug. 28 – 8 a.m. Saturday, Aug. 29.”
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I-405 will have overnight closures from Northeast 85th Street to 100th Street northbound“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 5 a.m. Monday, Aug. 31. A signed detour will be in place.”
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The overnight closures on I-405 will start Friday night, Aug. 28“405: Up to four lanes of southbound I-405 from milepost 14.25 to milepost 12.5 will be closed overnight, 10 p.m. Friday, Aug. 28 – 8 a.m. Saturday, Aug. 29.”
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The overnight closures on I-405 will end Monday morning, Aug. 31No usable supporting receipt — unverified.
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SR 9 will have alternating traffic through a bypass road near Kalloch Road for 42 days“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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The SR 9 bypass road project near Kalloch Road will end on 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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SR 9 will have alternating traffic Mondays through Thursdays near Mount Vernon Big Lake Road“009: Northbound and southbound traffic will alternate from 10 a.m. to 4 p.m. daily Mondays through Thursday through Thursday, Sept. 3, just south of Mount Vernon Big Lake Road (milepost 49) for fish passage construction. Expect delays in the area.”
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The alternating traffic on Mount Vernon Big Lake Road will end on Sept. 3“Northbound and southbound traffic will alternate from 10 a.m. to 4 p.m. daily Mondays through Thursday through Thursday, Sept. 3, just south of Mount Vernon Big Lake Road (milepost 49) for fish passage construction.”
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The closures are for fish passage construction on SR 9No usable supporting receipt — unverified.
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The closures are for highway maintenance on I-405No usable supporting receipt — unverified.
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The closures are for highway maintenance on SR 599No usable supporting receipt — unverified.
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WSDOT notes delays are expected in affected areas“Expect delays in the area.”
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The SR 9 project webpage provides more details on the fish passage work“More information on the <a href="https://wsdot.wa.gov/construction-planning/search-projects/sr-9-unnamed-tributaries-nookachamps-hansen-creeks-fish-passage">project webpage</a>.”