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: $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: August 2021
• Anticipated construction completion: early 2025

Get Involved

• Open House - Oct. 25, 2016

Downloads

• Comment and Response Report
• Construction Information
• Schematic