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San Antonio Area Freeway System
PROJECT INFO: I-35 from Loop 410 NE to Loop 410 S

This page last updated March 12, 2019


Project locationLocation
I-35 from Thousand Oaks to Binz-Engleman


This $52 million project added an additional main lane in each direction between Loop 410 NE and Loop 410 South, revised several ramps, and added auxiliary lanes. The previous lefthand exit from I-35 southbound to Loop 410 South was converted to a righthand exit. The I-35 northbound frontage road now continues through both the Loop 410 South interchange and the Loop 410 NE/Randolph Blvd. interchange. A new exit for Walzem Rd. has added to the ramp from Loop 410 NE to southbound I-35.

How this project will help
This area experiences recurring congestion due to insufficient capacity and obsolete ramp configurations. The lefthand exit for Loop 410 South was particularly problematic as many trucks enter southbound I-35 from Rittiman and immediately crossed all lanes of I-35 to reach Loop 410 South. By converting that exit to a righthand exit and providing a direct slip ramp from Rittiman, that weaving has been eliminated, thereby dramatically smoothing traffic flow and improving safety.

On the opposite side of the same interchange, the additional lane from northbound Loop 410 onto I-35 increases capacity. Removing the former Rittiman exit at that location eliminated the weaving there that also caused significant congestion and hazards. Northbound I-35 traffic destined for Rittiman now exits at a new exit just north of George Beach and the frontage road has been extended through the interchange to connect with the existing frontage road near Space Center Dr.

An additional through lane added to each direction of I-35 between the Loop 410 interchanges has increased raw capacity, the entrance and exit ramps between Rittiman and Walzem have been reversed, and auxiliary lanes added between them improve traffic flow and provide better access to adjacent properties.

The northbound exit to Thousand Oaks has been closed; traffic destined for Thousand Oaks from Loop 410 or from northbound I-35 now exits at the Randolph Blvd. exits and continues through the Loop 410 interchange on a new frontage road that connects to the existing frontage road just north of the park and ride. Like the removal of the Rittiman exit, this eliminated the weaving problem there.

Finally, a new exit ramp for Walzem Rd. from the Loop 410 eastbound ramp to I-35 southbound is expected to move an appreciable amount of Walzem-bound traffic onto the frontage road earlier in order to reduce the frequent backup from the exit further south.

Construction commenced in November 2013 and is now expected to be complete in mid 2018. 
Click here for the latest status report on this project.

Due to numerous unforseen issues, this project ran much longer than initially planned. TxDOT and the contractor plan to conduct a review of the project for lessons-learned.

Click on the image below to see an annotated overview schematic of this project. The base schematic is courtesy of TxDOT; the annotations are my own. Keep in mind that this is a simplified schematic and is not to scale. More detailed schematics are available on TxDOT's site (link below.)

Other sites of interest
TxDOT - I-35 Improvements

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