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I-35 at Posey Road


This project consists of replacing the existing interchange configuration with a new I-35 mainlane bridge over an at-grade reconstructed Posey Road, constructing new approaches, making intersection improvements, adding U-turns, performing ramp reversals, and converting two-way frontage roads to one-way. Currently, the I-35 mainlanes go under Posey Road. The new configuration would have the I-35 mainlanes going over Posey Road.

Need & Purpose

  • Improve safety and mobility

Project Description

  • Demolish existing Posey Road bridge, including elevated approaches
  • Construct a new I-35 mainlane bridge over Posey Road with new frontage road intersections
  • Add turn lanes on Posey Road at both the north and southbound frontage road intersections and U-turn lanes
  • Reverse six entrance and exit ramps between Centerpoint Road and York Creek Road
  • Add auxiliary lanes, or extended entrance/exit lanes, from south of Centerpoint Road to south of Posey Road
  • Convert the last two-way frontage roads in Hays County to one-way frontage roads between Posey Road and York Creek Road
  • Replace I-35 cross culverts under both frontage roads and mainlanes within mainlane reconstruction limits.
  • Mill, seal and overlay I-35 mainlanes from Centerpoint to the Hays/Comal County line.


  • Hays County/TxDOT Partnership Program
  • Project development funded by Hays County
  • Construction funded by TxDOT
  • Construction cost: $31.7 million


  • Public open houses: April 2014, January 2015
  • Finalize schematic and environmental documentation: fall 2016
  • Begin Plans, Specifications and Estimates (PS&E): August 2015
  • Complete PS&E: summer 2018
  • Construction letting: August 2018
  • Construction start: February 2019
  • Construction completion: December 2021


Project Vicinity Map

Posey Road map


Public Information Officer
(512) 832-7000

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

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