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 William Cannon Drive bridge at I-35 will be closed so construction crews can set beams for the elevated managed lanes as part of the I-35 Capital Express South project. To perform work safely and efficiently, crews will close the William Cannon Drive bridge for two consecutive weekends. *The planned closure for this bridge has been rescheduled due to inclement weather.

• Friday, May 29 at 10 p.m. to Monday, June 1 at 5 a.m.
• CANCELED: Friday, June 5 at 10 p.m. to Monday, June 8 at 5 a.m.
• UPDATED: Friday, June 12 at 10 p.m. to Monday, June 15 at 5 a.m.
• IF NEEDED: Friday, June 19 at 10 p.m. to Monday, June 22 at 5 a.m.

Detours: See map

From eastbound on William Cannon Drive: Drivers will turn right on the I-35 frontage road to access southbound I-35 or use the U-turn at Slaughter Lane to head north.

From westbound on William Cannon Drive: Drivers will turn right on the I-35 frontage road to access northbound I-35 or use the U-turn at Stassney Lane to head south.

During these two weekends, there will also be lane reductions on the I-35 mainlanes and both directions of the frontage roads.

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

View a detour video here.

Latest update

• June 5, 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