Long term lane closures 9th street tunnel begin september 28
9th St Tunnel Closures Begin
🚨 Alert — what to do now
DDOT is implementing long-term lane closures in the southbound 9th Street Tunnel starting September 28, 2026, through June 30, 2027, for structural and infrastructure repairs.
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Work Location — Southbound 9th Street Tunnel, beginning near Constitution Avenue NW and continuing beneath the National Mall
Source quotes (7)
District Department of Transportation — “(Washington, DC) — The District Department of Transportation (DDOT)”
Work Location — “Southbound 9th Street Tunnel, beginning near Constitution Avenue NW”
Continuous Outer Lane Closure — “One outer southbound travel lane closed 24/7.”
Off-Peak Center Lane Closures — “6-hour temporary closure of the center travel lane as needed.”
Lane Closure Start and End Dates — “Dates: September 28, 2026, through June 30, 2027.”
Reason for Work — “repairs and maintenance to tunnel infrastructure following damage sustained earlier this year.”
Sequence of Lane Closures — “Work will begin with the left outer lane before transitioning to the right outer lane”
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