Drivers on parts of I-35 and Loop 410 on San Antonio’s Northeast Side should plan for several overnight closures in late September as work continues on the I-35 Northeast Expansion Program.
The Texas Department of Transportation said multiple closures are scheduled, weather permitting, and drivers should follow posted detour signs.
I-35 to I-410 South connector and ramps
TxDOT said the following will be closed:
Southbound I-35 connector ramp to southbound I-410 SouthSouthbound I-35 entrance ramp to southbound I-410 SouthNorthbound I-35 frontage road at the I-410 South interchange
The closure is expected weeknights from 9 p.m. to 5 a.m. Monday through Thursday, Sept. 21-24, and from 11 p.m. to 7 a.m. Friday, Sept. 25, 2026.
Detours:
Drivers on southbound I-35 trying to enter southbound I-410 South will take Exit 162 to the southbound I-35 frontage road, continue to the signalized turnaround at George Beach Avenue, enter the northbound I-35 frontage road, keep right to the southbound I-410 South frontage road, then use the entrance ramp south of Winnco Drive to enter the southbound I-410 South mainlanes.Drivers on the northbound I-35 frontage road at the I-410 South interchange will keep right and follow signs to I-410 South, enter the southbound I-410 South frontage road, then use the signalized turnaround at Binz Engleman Road to enter the northbound I-35 frontage road.
Southbound I-35 frontage road south of Fratt Road and Exit 165
TxDOT said the following will be closed:
Southbound I-35 frontage road south of Fratt RoadSouthbound I-35 Exit 165
This closure is expected from 9 p.m. to 5 a.m. Tuesday and Wednesday, Sept. 22 and 23, 2026.
Detours:
Drivers on the southbound I-35 frontage road will turn right on Fratt Road, turn left on Interchange Parkway, turn left on Walzem Road, then turn right to re-enter the southbound I-35 frontage road.Drivers on southbound I-35 looking to exit to Walzem Road via Exit 165 will continue on the southbound I-35 mainlanes and exit via Exit 164 B to the southbound I-35 frontage road, use the U-turn at Eisenhauer Road to enter the northbound I-35 frontage road, then follow it to Walzem Road.
Walzem Road area: frontage road and U-turn closures (overnight)
TxDOT said the following will be closed:
Southbound I-35 frontage road south of the Fratt Road entrance ramp to Exit 164 BNorthbound-to-southbound U-turn at Walzem Road
This closure is expected from 9 p.m. to 5 a.m. Monday and Thursday, and from 11 p.m. to 7 a.m. Friday, Sept. 21, 24, and 25, 2026.
Detours:
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
Drivers on Walzem Road looking to access southbound I-35, and drivers on northbound I-35 looking to U-turn at Walzem Road, will be directed to one of two detour options:
Detour option 1: Follow detour signs to the northbound I-35 frontage road, continue to Northeast I-410 Loop, keep left to turn around to the southbound I-35 frontage road, enter the southbound I-35 mainlanes north of Walzem Road, then access the southbound I-35 frontage road from the Eisenhauer Road exit.Detour option 2: Follow detour signs on Walzem Road, turn north onto Interchange Parkway, continue to Fratt Road and turn right, then turn right to enter the southbound I-35 frontage road and enter the southbound I-35 mainlanes north of Walzem Road. Drivers trying to access the southbound I-35 frontage road will use the Eisenhauer Road exit.
Walzem Road area: longer closures Tuesday-Wednesday and Wednesday-Thursday
TxDOT also said the following will be closed:
Southbound I-35 frontage road south of Walzem RoadNorthbound-to-southbound U-turn at Walzem Road
This closure is expected from 7 p.m. Tuesday, Sept. 22, to 6 a.m. Wednesday, Sept. 23, and from 3 p.m. Wednesday, Sept. 23, to 5 a.m. Thursday, Sept. 24, 2026.
Detours for this closure are the same as listed above for the Walzem Road area, including routing drivers to the southbound I-35 mainlanes north of Walzem Road and using the Eisenhauer Road exit ramp to return to the frontage road, with two detour options for Walzem Road access and the northbound-to-southbound U-turn.
Southbound I-35 mainlanes closure near Eisenhauer Road
TxDOT said southbound I-35 mainlanes from Exit 164 A to the Eisenhauer Road entrance ramp will be closed from 9 p.m. to 5 a.m. Thursday, Sept. 24, 2026.
Detour:
Drivers on the southbound I-35 mainlanes will exit via Exit 164 A to the southbound I-35 frontage road and re-enter the southbound I-35 mainlanes at the next available entrance ramp.