Infrastructure

I-405, SR 9 closures continue through Labor Day

Thursday, August 27, 2026

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I-405 will see multiple lane closures through Labor Day weekend, including northbound lanes from Northeast 70th Place to Northeast 85th Street from 11 p.m. Friday, August 28 to 4 a.m. Monday, August 31, and northbound lanes from Northeast 85th Street on-ramp to Northeast 100th Street from 11 p.m. Friday, August 28 to 4 a.m. Monday, August 31. Both closures will have signed detours in place.

SR 9 will have single-lane traffic near Kalloch Road (MP 59) until September 14 for fish passage construction, with alternating traffic through a bypass road. A separate project on SR 9 just south of Mount Vernon Big Lake Road (MP 49) will have alternating traffic Mondays through Thursdays until September 3. WSDOT's website provides more details on these projects.

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

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I-405 will see multiple lane closures through Labor Day weekend“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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Northbound lanes from Northeast 70th Place to Northeast 85th Street will have closures from 11 p.m. Friday, August 28 to 4 a.m. Monday, August 31“405: All lanes of northbound I-405 will close from Northeast 70th Place to Northeast 85th 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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Northbound lanes from Northeast 85th Street on-ramp to Northeast 100th Street will have closures from 11 p.m. Friday, August 28 to 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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Both closures will have signed detours in placeNo usable supporting receipt — unverified.
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SR 9 will have single-lane traffic near Kalloch Road (MP 59) until September 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 through a bypass road near Kalloch Road (MP 59) until September 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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A separate project on SR 9 just south of Mount Vernon Big Lake Road (MP 49) will have alternating traffic Mondays through Thursdays until September 3“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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WSDOT's website provides more details on these projects“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>.”