Major Lane Closures on I-35 and Long-term Detours on Loop 1604 for Wednesday, March 4

Morning Commute Overview

San Antonio commuters should prepare for a mix of scheduled maintenance and ongoing long-term construction projects this Wednesday, March 4, 2026. While major arteries like US-281 and Loop 410 are currently seeing typical peak-hour volumes, specific lane closures on I-35 and ramp changes on Loop 1604 will likely impact travel times for those heading into the city or navigating the North Side.

Key Highway Impacts: I-35 and Loop 1604

Two primary maintenance projects are scheduled for I-35 today. Drivers traveling south of the city should watch for a right-lane closure on IH-35 South over US-57. This closure is scheduled from 9:00 AM to 5:00 PM for critical bridge joint repairs. Additionally, northbound commuters on I-35 should anticipate delays near Exit 154A (Powell St) as crews perform guard rail repairs starting at 4:00 PM. Traffic may bottleneck in these areas during the late afternoon rush.

On the North Side, the multi-billion dollar Loop 1604 North Expansion project continues to reshape the commute. A significant long-term closure remains in effect for the entrance ramp to westbound Loop 1604 at O’Connor Road. Drivers needing to access the westbound lanes between O’Connor and Bulverde roads must continue along the frontage road past Bulverde Road to reach the next available ramp. In the Northwest corridor, near The Rim, the left lane of the westbound I-10 access road from La Cantera Parkway to Rim Drive is also closed for ongoing drainage work.

VIA Metropolitan Transit and Public Transport Alerts

Public transit riders should plan for delays and route adjustments. VIA Metropolitan Transit has confirmed several active detours due to the 1604 expansion and the new Green Line Advanced Rapid Transit construction. Key impacts include:

• Route 5: Detour on McCullough due to construction; the North Star Transit Center stop remains closed.
• Route 7: Detours on the US-281 Stone Oak/Brooks Express impacting service between Brooks Transit Center and City Base Landing.
• Route 34: Frequent service adjustments near South New Braunfels and SE Military Drive.

Construction for the Green Line is currently focusing on utility relocation along San Pedro Avenue and Saint Mary’s Street. While the project aims for 10-minute weekday frequency upon completion, the current phase involves intermittent intersection closures and noise between downtown and North Star Mall.

Advice for Commuters

Given the maintenance on I-35 and the ramp closures on Loop 1604, residents are encouraged to allow an extra 15 to 20 minutes for their afternoon travel. Using navigation apps to monitor real-time bottlenecks at the I-10 and Loop 1604 interchange is highly recommended, as flyover construction remains active in that sector.