SAN ANTONIO – Nightly closures tied to the I-35 Northeast Expansion Program are expected to affect parts of Interstate 35 and the I-35/I-410 South interchange in mid-July, with TxDOT urging drivers to follow posted detours.

The Texas Department of Transportation said the southbound I-35 frontage road will be closed south of the Fratt Road entrance ramp to Exit 164 B. The northbound-to-southbound U-turn at Walzem Road will also be closed.

TxDOT said those nightly closures are expected from 9 p.m. to 5 a.m. Monday through Thursday, July 13-16, and from 11 p.m. to 7 a.m. Friday, July 17, 2026, weather permitting.

Detours for the Walzem Road area

TxDOT said drivers on the southbound I-35 frontage road will follow detour signs to enter the southbound I-35 mainlanes north of Walzem Road and use the Eisenhauer Road exit ramp to return to the frontage road.

For drivers on Walzem Road trying to access southbound I-35, and for drivers on northbound I-35 trying to make a U-turn at Walzem Road, TxDOT said traffic will be directed to one of two detour options:

Detour option 1: Drivers will follow detour signs to the northbound I-35 frontage road, continue to the Northeast I-410 Loop and keep left to turn around to the southbound I-35 frontage road. Drivers will then enter the southbound I-35 mainlanes north of Walzem Road and access the southbound I-35 frontage road from the Eisenhauer Road exit.

Detour option 2: Drivers will follow detour signs on Walzem Road, turn north onto Interchange Parkway, continue to Fratt Road and turn right. Drivers will then turn right to enter the southbound I-35 frontage road and enter the southbound I-35 mainlanes north of Walzem Road. Those trying to access the southbound I-35 frontage road will use the Eisenhauer Road exit.

Additional closures at the I-35 and I-410 South interchange

TxDOT also said additional nightly closures are expected at the I-35 and I-410 South interchange during the same time windows: 9 p.m. to 5 a.m. Monday through Thursday, July 13-16, and 11 p.m. to 7 a.m. Friday, July 17, 2026, weather permitting.

Those closures include:

The southbound I-35 connector ramp to southbound I-410 SouthThe northbound I-35 connector to the southbound I-410 South frontage roadThe northbound I-35 frontage road at the I-35 and I-410 South interchange

Detours for the interchange closures

TxDOT said drivers on southbound I-35 who want to connect to southbound I-410 South will take temporary Exit 162, follow the southbound I-35 frontage road to the signalized turnaround at George Beach Avenue, then enter the northbound I-35 frontage road and follow the northbound I-35 frontage road detour.

Drivers on the northbound I-35 frontage road at the I-410 South interchange will turn right onto Winnco Drive, then right again onto the southbound I-410 South frontage road.

TxDOT said they will then use the signalized turnaround at Binz Engleman Road to enter the northbound I-35 frontage road.