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I-35 at SH 123

This project includes improving the SH 123 intersection and ramp reversals along I-35 between SH 80 and RM12

Project Activity

  • Construction Closure

    Southbound I-35 frontage road right lane closed continuously from Rio Vista Street to CM Allen Parkway

    Through late 2021

  • Lane Closure

    Southbound I-35 frontage road left lane closed nightly at SH 123

    Monday, Oct. 25 through Thursday, Oct. 28 from 8 p.m. until 6 a.m.

Project Activity

Project activity includes improvements to the northbound and southbound I-35 frontage roads and bridges at the San Marcos River. TxDOT anticipates periodic closures of the river at I-35 to complete the work. Recreational users along the San Marcos River will be notified in advance of any closures via shore signs and can sign up for additional project updates.


  • Construction cost: $107 million funded by CAMPO and TxDOT 


  • Construction start: August 2021
  • Anticipated construction completion: early 2025, weather permitting


  • Webber, LLC

Project Map

Map of I-35 at SH 123


Reconstruct northbound frontage road

  • Reconstruct the northbound I-35 frontage road north of SH 123 and the bridges over the San Marcos River and Willow Springs

Reconstruct southbound frontage road

  • Reconstruct the southbound I-35 frontage road north of SH 123, including the San Marcos River bridge

Reconstruct northbound I-35 frontage road

  • Reconstruct the northbound I-35 frontage road south of SH 123

Finalize Project

  • Perform final paving and striping


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