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Project history

Project summary

  • Project Limits: I-35 from I-410 N to FM 3009
  • Project Construction Cost: $1.5B
  • Contractor: Alamo NEX Construction, LLC
  • Construction Start Date: June 2022
  • Estimated Completion Date: 2027

Project scope

Construction of three elevated lanes, including two mainlanes and one high-occupancy vehicle (HOV) lane in each direction. The I-35 elevated lanes will provide direct connections to I-410 South,  I-410 North, and Loop 1604 West.

Widening of I-35 general purpose lanes from north of Olympia Parkway to south of FM 3009, along with reconstruction of Loop 1604 general purpose lanes and bridges from Nacogdoches Road to I-35.

Operational improvements including the construction of ramps to connect I-35 mainlanes to elevated lanes, and reconfiguration of entrance and exit ramps throughout the project. 

Project information

The Texas Department of Transportation (TxDOT) awarded Alamo NEX Construction the I-35 NEX Central Project. Construction began in June 2022. The project consists of the design, construction and maintenance of approximately 9.5 miles of non-tolled improvements along I-35 and spans the cities of San Antonio, Live Oak, Selma and Schertz in Bexar and Guadalupe counties.

Project summary graphic

For project background and previous public involvement and environmental studies visit the projects and studies page. Click through the milestones below to see how the project has progressed throughout the years. 

Project map

Project milestones

Planning and Environmental Linkage (PEL) Study Completed
  • Need and purpose
  • Traffic demand study
  • Recommended additional capacity to I-35 and improve I-410 and Loop 1604 interchanges
  • Analyzed right-of-way (ROW) impacts at grade expansion