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I-35 at US 79 (southbound)


The project includes constructing an auxiliary lane to remove merging conflicts on the I-35 southbound mainlanes between RM 620 and Hesters Crossing. The proposed southbound auxiliary lane extending from the US 79 entrance ramp to the SH 45N exit ramp will eliminate a forced merge. The existing southbound auxiliary lane from the RM 620 entrance ramp to the Hesters Crossing exit ramp will remain. There will be no construction on the frontage roads or changes to ramp locations.

Need & Purpose

  • Improve safety and mobility

Project Description

  • Shift centerline median barrier and mainlane striping to the east to accommodate proposed auxiliary lane


  • Project development funded by TxDOT
  • Construction cost: $8.4 million


  • Begin Plans, Specifications and Estimates (PS&E): early 2019
  • Finalized schematic and environmental documentation: early 2021
  • PS&E completed: August 2021
  • Construction letting: August 2021
  • Construction start: March 2022
  • • Anticipated construction completion: mid-2023


Project Vicinity Map

US 79 to SH 45 North (Southbound) map


Public Information Officer
(512) 832-7000

TxDOT Austin District
P.O. Box 15426
Austin, TX 78761-5426

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