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I-35 serves as a major gateway in the San Antonio area. As San Antonio continues to grow, congestion along I-35 also increases. To address this congestion, the Texas Department of Transportation (TxDOT) is proposing improvements to I-35 northeast of downtown. The proposed improvements will also address safety and improve this section of I-35 to better meet growing demands from additional motorists. 

TxDOT completed a preliminary study, called a Planning and Environmental Linkage (PEL) study in 2013. This study examined potential improvements along I-35 from near downtown San Antonio to FM 1103 in Schertz. To build on this study, TxDOT initiated a detailed environmental study to add lanes on I-35. The proposed improvements to I-35 from the I-35/I-410 South interchange to FM 1103 include:

  • Adding managed lanes generally within existing right of way
  • Improving interchanges at Loop 1604, I-410 North and I-410 South to better accommodate added lanes

A public hearing was held on the proposed project in February 2015. A Finding of No Significant Impact (FONSI) was issued in July 2015.

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Downloads Format
Finding of No Significant Impact (FONSI)
Final Environmental Assessment
Public Hearing Summary and Analysis Report
I-35 PEL Study Final Report
Appendix A - Summary of Previous Reports
Appendix B - Need and Purpose Technical Report
Appendix C - Agency Coordination Technical Report
Appendix D - Public Meeting Summary and Analysis Report - November 2011
 - Public Meeting Summary and Analysis Report - February 2012
 - Public Meeting Summary and Analysis Report - June 2012
 - Public Meeting Summary and Analysis Report - October 2012
Appendix E - Affected Environment Technical Report
 - Affected Environment Technical Report Appendices A-B
 - Affected Environment Technical Report Appendices C-F
Appendix F - Alternative Concepts Development and Evaluation Technical Report
FHWA PEL Letter of Completion

Contact Us

TxDOT Public Information Officer
P.O. Box 29928
San Antonio, TX 78229-0928

(210) 615-5839
Email