Dallas Will Delay Drainage Tunnel Completion to 2029
The Mill Creek Relief Tunnel project faces further delays due to supply chain issues and productivity hurdles.
Updated on Oct. 2, 2026 in Remote Work
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The city of Dallas has announced that the Mill Creek Drainage Relief Tunnel will be completed by early 2029. Ongoing work to modernize flood mitigation systems, which originally began in 2018, has been delayed by supply chain disruptions and permitting challenges.
Why it matters
The project is essential for upgrading drainage systems built in the 1930s to prevent flooding in the area. Delays were attributed to pandemic-era supply chain issues and overly optimistic projections regarding worker productivity.
The $320 million, 5-mile tunnel project is currently 87% complete. Workers have finished 64% of the task to line the structure with 15 inches of concrete.
The players
City of Dallas
This local municipal government is responsible for managing major infrastructure and flood control initiatives.
The details
The 5-mile tunnel stretches from the intersection of U.S. Highway 75 and Woodall Rodgers to White Rock Creek to mitigate flooding. Contractors are currently in the concrete lining phase, which requires installing 15 inches of material and is expected to last until Fall 2028.
Timeline
Voters approved initial bond funding for the project in 2006.
Construction on the drainage tunnel officially began in 2018.
The project reached 87 percent completion by late September 2026.
The tunnel concrete lining phase is scheduled to end in Fall 2028.
The city expects full completion of the project by early 2029.
Market Landscape
This project follows the funding timeline set by the 2012 Dallas flood bond measures. The completion date extends the timeline for infrastructure improvements originally funded by those specific measures.
Residents in the area should expect construction activity to continue near major corridors for several more years. The extended timeline maintains the status quo for flood risk until the system is fully operational in 2029.
The takeaway
This delay highlights the long-term logistical challenges associated with upgrading urban infrastructure designed nearly a century ago. Property owners in impacted zones should continue to review local flood mitigation guidance until construction concludes.
Further reading
For more updates on regional infrastructure development, visit the Remote Work section.
Source note: This article includes information reported by The Dallas Morning News.
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