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I-35 at 51st Street


The project added an intersection bypass lane at 51st Street to allow through-traffic to bypass the traffic signal and added a new roundabout at the intersection of the southbound I-35 frontage road and 51st Street. Bicycle and pedestrian accommodations were also improved along the southbound I-35 frontage road within the project limits.

Need & Purpose

  • Improve safety and mobility

Project Description

  • Realigned southbound frontage road
  • New southbound intersection bypass lane
  • New roundabout at the southbound frontage road of I-35 and 51st Street
  • Reconfigured ramps
  • Improved bicycle and pedestrian accommodations


  • Project development funded by TxDOT
  • Construction funded by Texas Clear Lanes Congestion Relief Initiative and city of Austin
  • Construction cost: $16.5 million


  • Finalized schematic and environmental documentation: September 2015
  • Begin Plans, Specifications and Estimates (PS&E): September 2015
  • Complete PS&E: June 2016
  • Construction letting: June 2016
  • Construction start: October 2016
  • Construction completion: June 2018

Get Involved



Project Vicinity Map

51st Street map


Public Information Officer
(512) 832-7000

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

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