Development

I-405, I-90 closures to impact Pullman traffic

Thursday, September 3, 2026

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I-405 and I-90 will see multiple lane closures and detours starting overnight Thursday, Aug. 31, through Friday, Sept. 4, according to Washington State Department of Transportation (WSDOT) records.

WSDOT will close up to two lanes of southbound I-405 from milepost 12 to Coal Creek Parkway Southeast, and up to two lanes of northbound I-405 from milepost 7 to 8.5. Eastbound I-90's Factoria Boulevard off-ramp will close nightly. All closures are scheduled between 9 p.m. and 5 a.m.

The closures are part of ongoing infrastructure work, including pavement repairs, utility installations, and fish passage construction. WSDOT urges drivers to expect delays and follow detour signs.

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

Source receipts6 of 13 claims supported · 46%

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I-405 and I-90 will see multiple lane closures and detours starting overnight Thursday, Aug. 31No usable supporting receipt — unverified.
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I-405 and I-90 will see multiple lane closures and detours through Friday, 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. 405: Up to two lanes of northbound I-405 from milepost 7 to milepost 8.5 will be closed nightly, 9 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4. 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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Washington State Department of Transportation (WSDOT) records state the closuresNo usable supporting receipt — unverified.
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WSDOT will close up to two lanes of southbound I-405 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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WSDOT will close up to two lanes of northbound I-405 from milepost 7 to 8.5“405: Up to two lanes of northbound I-405 from milepost 7 to milepost 8.5 will be closed nightly, 9 p.m. Monday, Aug. 31 – 4:30 a.m. Friday, Sept. 4.”
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Eastbound I-90's Factoria Boulevard off-ramp will close nightly“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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All closures are scheduled between 9 p.m. and 5 a.mNo usable supporting receipt — unverified.
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The closures are part of ongoing infrastructure work“Daily (except Saturday, Sunday) beginning Aug. 21 until further notice: State Route 20 traffic will alternate with flaggers from the Swin Slough Bridge (milepost 50) to Laconner Whitney Road/Bay View Road (milepost 53) for city Anacortes utilities work.”
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The closures include pavement repairs“405: From 9 p.m. to 5 a.m. nightly Tuesday, Sept. 1, through Thursday morning, Sept. 3, up to three lanes of northbound I-405 will close between NE 116th and NE 145th Streets for crack sealing and pavement repair. Expect delays through the work zone.”
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The closures include utility installationsNo usable supporting receipt — unverified.
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The closures include fish passage constructionNo usable supporting receipt — unverified.
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WSDOT urges drivers to expect delaysNo usable supporting receipt — unverified.
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WSDOT urges drivers to follow detour signsNo usable supporting receipt — unverified.