I-35 at SH 123

Overview:

This project consists of interchange improvements at I-35 and SH 123 and ramp reversals between SH 80 and RM 12.

Need & Purpose
  • Improve safety and mobility
Project Description
  • Reconstruct and improve the SH 123 traditional interchange
  • Reverse four ramps along the northbound frontage road between SH 80 and RM 12
  • Reverse one entrance ramp along the southbound frontage road between SH 80 and SH 123
  • Realign the existing southbound exit ramp to SH 123 (CM Allen Parkway)
  • Relocate the entrance ramp along the southbound frontage road from SH 80
  • Reconstruct portions of the northbound and southbound frontage roads, including improving bicycle and pedestrian accommodations
  • Reconstruct the frontage road bridges over Willow Springs Creek
  • Raise and reconstruct the northbound frontage road bridge over the San Marcos River
  • Widen the southbound frontage road bridge over the San Marcos River
  • Reconstruct the mainlanes and bridge over SH 123
  • Add auxiliary lanes, or extended entrance/exit lanes, to the mainlanes and frontage roads
Funding
  • Project development funded by TxDOT
  • Construction funded by Capital Metropolitan Planning Organization and TxDOT
  • Construction cost estimate: $107 million
Schedule
  • Finalized schematic and environmental documentation: anticipated late 2017
  • Begin Plans Specifications and Estimates (PS&E) documentation: anticipated late 2017
  • Complete PS&E: anticipated early 2020
  • Construction letting: anticipated early 2020
  • Construction start: anticipated mid-2020
  • Construction completion: anticipated late 2022
Get Involved
Downloads

Project Vicinity Map

FM150-Blanco

Contact

Public Information Officer

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

(512) 832-7000

Email