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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 December 4, 2016

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

Status: Under construction (90% complete)

Description: This $52 million project will add one additional main lane in each direction between Loop 410 NE and Loop 410 South, revise several ramps, and add auxilary lanes.  The existing lefthand exit from I-35 southbound to Loop 410 South will be converted to a righthand exit.  The
I-35 northbound frontage road will be continued through both the Loop 410 South interchange and the Loop 410 NE/Randolph Blvd. interchange.  A new exit for Walzem Rd. will be 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 is particularly problematic as many trucks enter southbound I-35 from Rittiman and immediately cross 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 will be eliminated, thereby dramatically smoothing traffic flow and improving safety.

On the opposite side of the same interchange, an additional lane will be provided from northbound Loop 410 onto I-35 to increase capacity and the Rittiman exit at that location will be removed; this will eliminate the weaving there that also causes significant congestion and hazards.  Northbound I-35 traffic destined for Rittiman will exit at a new exit to be built just north of George Beach and the frontage road will be extended through the interchange to connect with the existing frontage road near Space Center Dr.

An additional through lane will be added to each direction of I-35 between the Loop 410 interchanges to increase raw capacity, the entrance and exit ramps bertween Rittiman and Walzem will be reversed, and auxilary lanes added between them to improve traffic flow and provide better access to adjacent properties.

The northbound exit to Thousand Oaks will also be closed; traffic destined for Thousand Oaks from Loop 410 or from northbound I-35 will exit at the current Randolph Blvd. exits and continue through the Loop 410 interchange on a new frontage road that will connect to the existing frontage road just north of the park and ride.  Like the removal of the Rittiman exit, this will eliminate the weaving problem there.

Finally, a new exit ramp for Walzem Rd. will be added from the Loop 410 eastbound ramp to I-35 southbound; this should move an appreciable amount of Walzem-bound traffic onto the frontage road to reduce the frequent Walzem exit overflow .

Timeline: Construction commenced in November 2013 and is now expected to be complete in mid 2017.  Click here for the latest status report on this project.

Schematic: 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
http://www.txdot.gov/inside-txdot/projects/studies/san-antonio/i35-i410.html




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This page and all its contents are Copyright 2017 by Brian Purcell

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