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I-35 at SH 123

Overview

This project consists of intersection 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 intersection
  • Reverse two ramps along the northbound frontage road between SH 80 and SH 123
  • 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: August 2017
  • Begin Plans, Specifications and Estimates (PS&E): August 2017
  • Complete PS&E: mid-2021
  • Construction letting: anticipated mid-2021
  • Construction start: anticipated late 2021
  • Construction completion: anticipated late 2023

Get Involved

Downloads

Project Vicinity Map

SH 123 map

CONTACT

Public Information Officer
(512) 832-7000
Email

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

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