Infrastructure

I-405, I-90 closures this week

Tuesday, September 1, 2026

2 min read

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I-405 and I-90 will see overnight closures in Vancouver this week for construction and utility work. The most significant changes include up to four lanes of northbound I-405 closing nightly from milepost 11.5 to 13.7 between 9:30 p.m. and 4:30 a.m. through Sept. 4, and up to two lanes of southbound I-405 closing from milepost 12 to Coal Creek Parkway Southeast from 9 p.m. Thursday to 5 a.m. Friday, Sept. 4.

WSDOT will provide signed detours for the eastbound I-90 off-ramp closure to Factoria Boulevard and for the SR 527 right lane closure. The closures are part of ongoing infrastructure work, including city utility projects in Anacortes and buried gas main line extensions on SR 4 between 50th and 42nd Avenues. The most extended closure runs through Sept. 11 on SR 4, which will have single-lane traffic weekdays from 7:30 a.m. to 5 p.m.

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

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I-405 and I-90 will see overnight closures in Vancouver this week for construction and utility workNo usable supporting receipt — unverified.
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The most significant changes include up to four lanes of northbound I-405 closing nightly from milepost 11.5 to 13.7“405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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The closure of up to four lanes of northbound I-405 will be between 9:30 p.m. and 4:30 a.m.“405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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The closure of up to four lanes of northbound I-405 will run through Sept. 4“405: Up to four lanes of northbound I-405 from milepost 11.5 to milepost 13.7 will be closed nightly, 9:30 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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Up to two lanes of southbound I-405 will close from milepost 12 to Coal Creek Parkway Southeast“405: Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast (milepost 10) will be closed overnight, 9 p.m. Thursday, Sept. 3 – 5 a.m. Friday, Sept. 4.”
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The closure of up to two lanes of southbound I-405 will be from 9 p.m. Thursday to 5 a.m. Friday“405: Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast (milepost 10) will be closed overnight, 9 p.m. Thursday, Sept. 3 – 5 a.m. Friday, Sept. 4.”
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The closure of up to two lanes of southbound I-405 will run through Sept. 4“405: Up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast (milepost 10) will be closed overnight, 9 p.m. Thursday, Sept. 3 – 5 a.m. Friday, Sept. 4.”
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WSDOT will provide signed detours for the eastbound I-90 off-ramp closure to Factoria Boulevard“090: The eastbound I-90 off-ramp to Factoria Boulevard will be closed nightly, 9 p.m. Monday, Aug. 31 – 5 a.m. Friday, Sept. 4. A signed detour will be in place.”
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WSDOT will provide signed detours for the SR 527 right lane closureNo usable supporting receipt — unverified.
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The closures are part of ongoing infrastructure workNo usable supporting receipt — unverified.
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The closures are part of city utility projects in AnacortesNo usable supporting receipt — unverified.
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The closures are part of buried gas main line extensions on SR 4 between 50th and 42nd AvenuesNo usable supporting receipt — unverified.
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The most extended closure runs through Sept. 11 on SR 4No usable supporting receipt — unverified.
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SR 4 will have single-lane traffic weekdays from 7:30 a.m. to 5 p.m.“004: Monday, Aug. 17 through Friday, Sept. 11: A single lane in both directions of SR 4 between 50th Avenue (milepost 56.4) and 42nd Avenue (milepost 57.2) will be closed weekdays from 7:30 a.m. to 5 p.m., for buried gas main line extension work.”