I-35 Capital Express South Project

Project overview

The project will add two high-occupancy-vehicle (HOV) managed lanes in each direction along I-35 between SH 71/Ben White Boulevard and SH 45 Southeast. In addition, the project will include a southbound I-35 bypass lane that will allow traffic to bypass Stassney Lane and William Cannon Drive. Entrance and exit ramps will also be reconstructed and relocated. Pedestrian and bicycle paths will also be added.

Major impacts/activity

The northbound I-35 mainlanes in South Austin will be closed for work on the elevated managed lanes. To perform work safely and efficiently, the northbound I-35 mainlanes will close nightly between Slaugther Lane and SH 71/Ben White Boulevard. The northbound flyover to SH 71 will also be closed.

• Friday and Saturday night, June 26 and June 27, 11 p.m. to 9 a.m.
• Friday and Saturday night, July 10 and July 11, 11 p.m. to 9 a.m.
  
• Friday and Saturday night, July 17 and July 18, 11 p.m. to 9 a.m.
  
• Friday and Saturday night, July 24 and July 25, 11 p.m. to 9 a.m. (if needed)

Detours: (see map below)

Drivers on northbound I-35 will use the William Cannon Drive exit (228), continue past Stassney Lane and merge onto northbound I-35.

To eastbound/westbound SH 71/Ben White Boulevard: Drivers will take exit 228, continue along the northbound I-35 frontage road and turn at Ben White Boulevard.

Drivers should remain alert, follow signs, and expect delays.

Latest update

• June 25, 2026

Schedule

• Construction start: November 2022
• Anticipated construction completion: Late 2028, weather permitting

Milestones

• Construct elevated lanes from SH 71/Ben White Boulevard to Slaughter Lane
• Construct at-grade managed lanes from Boggy Creek Drive to SH 45 Southeast
• Reconstruct I-35 bridge over South Boggy Creek
• Reconstruct I-35 bridge over Onion Creek
• Widen the I-35 bridge over Slaughter Creek
• Reconstruct I-35 entrance and exit ramps
• Construct shared-use paths along frontage roads
• Perform final paving and striping to finalize project

Funding

• Construction cost: $548 million funded by CAMPO and TxDOT

Contractor

• Fluor Corporation

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Project area

Downloads

• Construction Information
• Construction Information (Espanol)
• Final Environmental Assessment
• Finding of No Significant Impact
• Schematics