TxDOT breaks ground on massive drainage tunnel to reduce flooding in Austin
(UI) — To support major reconstruction along I-35 and improve flood resilience in central Austin, the Texas Department of Transportation (TxDOT) has launched construction on a major drainage tunnel and pump station system.
The project is part of the I-35 Capital Express Central initiative and aims to significantly enhance stormwater management along the corridor.
The plan includes building 6.5 miles of 22-foot-diameter drainage tunnels stretching from Airport Boulevard to Holly Street and along Cesar Chavez Street from I-35 to US 183. Access shafts will be constructed at various points to allow for ongoing maintenance and operations. A new pump station will also be added to help move stormwater away from the interstate and surrounding areas during severe weather events.
Construction is divided into four phases:
- Phase I includes utility relocation and site work at several drop shafts, including Airport Boulevard, 15th Street, Brushy Street, and River Street, as well as excavation at the Cesar Chavez/I-35 junction.
- Phase II focuses on excavating drop shafts at 15th Street, Cesar Chavez Street, and River Street.
- Phase III will launch tunnel boring machines and continue excavation and utility relocation at Hancock Center, Edgewood Avenue, and 11th Street.
- Phase IV involves connecting tunnel segments, restoring drop shaft sites, and installing the final tunnel lining.
Construction is funded by TxDOT and the Capital Area Metropolitan Planning Organization (CAMPO), with work beginning in May 2025. SAK/Shea JV has been selected as the contractor for the drainage tunnel, while Webber, LLC will handle the pump station.
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