Infrastructure

I-405 Southbound Lanes Closed for Work

Wednesday, July 29, 2026

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Two lanes of southbound I-405 will close nightly from 11 p.m. to 4 a.m. between mileposts 18.11 and 16.45, starting Monday, July 27, through Friday, July 31, according to WSDOT. The closure affects drivers traveling south on I-405 near mileposts 18.11 to 16.45. WSDOT notes flaggers will direct traffic during the work hours. The project is part of ongoing construction to improve the highway infrastructure.

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

Source receipts6 of 8 claims supported · 75%

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Two lanes of southbound I-405 will close nightly from 11 p.m. to 4 a.m.“405: Monday, July 27 to the morning of Friday, July 31: Up to two lanes of southbound I-405 between milepost 18.11 and milepost 16.45 will be closed, nightly from 11 p.m. – 4 a.m.”
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The closure is between mileposts 18.11 and 16.45“405: Monday, July 27 to the morning of Friday, July 31: Up to two lanes of southbound I-405 between milepost 18.11 and milepost 16.45 will be closed, nightly from 11 p.m. – 4 a.m.”
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The closure will start on Monday, July 27“405: Monday, July 27 to the morning of Friday, July 31: Up to two lanes of southbound I-405 between milepost 18.11 and milepost 16.45 will be closed, nightly from 11 p.m. – 4 a.m.”
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The closure will end on Friday, July 31No usable supporting receipt — unverified.
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The closure is according to WSDOT“WSDOT statewide highway construction and road closure updates — 7/28/2026:”
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The closure affects drivers traveling south on I-405 near mileposts 18.11 to 16.45“405: Monday, July 27 to the morning of Friday, July 31: Up to two lanes of southbound I-405 between milepost 18.11 and milepost 16.45 will be closed, nightly from 11 p.m. – 4 a.m.”
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WSDOT notes flaggers will direct traffic during the work hours“Flaggers and pilot cars will direct alternating traffic through the remaining open lane.”
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The project is part of ongoing construction to improve the highway infrastructureNo usable supporting receipt — unverified.