Southbound I-35 in Downtown San Antonio to Close for Month

TxDOT says the shutdown is needed to make repairs to bridge joints on the lower level of the highway.

Published on Feb. 26, 2026

Got story updates? Submit your updates here. ›

The Texas Department of Transportation (TxDOT) announced that it will close a stretch of southbound Interstate 35 through downtown San Antonio for about a month, starting on February 21. The closure will affect the lower level of I-35 between Interstate 37 and Interstate 10, while the upper level lanes will remain open. TxDOT says the shutdown is necessary to allow crews to repair bridge joints as part of a $25.9 million project to upgrade portions of I-35 and I-10 in the downtown area.

Why it matters

The closure of this major highway artery through downtown San Antonio will significantly impact commuters and travelers in the area, requiring them to seek alternate routes and plan for delays. The repairs are part of a larger infrastructure project aimed at improving the condition and functionality of the interstate system in the city's urban core.

The details

The southbound lanes of the lower level of I-35 between I-37 and I-10 will be closed from February 21 through mid-March. TxDOT says the closure is necessary to allow crews to repair bridge joints as part of a $25.9 million project to upgrade portions of I-35 and I-10 in downtown San Antonio. All lanes of the upper level of I-35 will remain open during the closure.

  • The closure will begin on Saturday, February 21, 2026.
  • The closure is expected to last approximately one month, until mid-March 2026.

The players

Texas Department of Transportation (TxDOT)

The state agency responsible for maintaining and improving the transportation infrastructure in Texas, including the interstate highway system.

Got photos? Submit your photos here. ›

What’s next

Drivers are encouraged to plan ahead for delays and seek alternate routes during the closure period.

The takeaway

The upcoming closure of a key section of southbound I-35 in downtown San Antonio will require commuters and travelers to adjust their routes and expect significant delays, highlighting the ongoing need for infrastructure maintenance and upgrades in the city's urban core.