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San Antonio Area Freeway System
PROJECT INFO: SH 151 at Loop 410

This page last updated November 30, 2018


Project locationLocation
Loop 410 from Ingram Rd. to SH 151 and SH 151 from Loop 410 to Hunt Ln.

Phase 1 complete

This $81.8 million project is constructing the first phase of a fully-directional interchange at Loop 410 and SH 151. Specifically, this phase has constructed the eastbound SH 151 to northbound Loop 410 and the southbound Loop 410 to westbound SH 151 connectors. In addition, Loop 410 is being widened to eight lanes from Ingram to SH 151 and auxiliary lanes have been added to both directions of 151 from Loop 410 to Potranco (eastbound) and Hunt (westbound.) Several ramps on Loop 410 and SH 151 have been relocated to accommodate the new connectors and to improve traffic flow. An access road flyover on southbound Loop 410 at Military has been added as will turnarounds on SH 151 at Ingram, Potranco, and Hunt.

How this project will help
This project is providing new direct connections on the heaviest turn movements in the 410/151 interchange. This will remove that traffic from the existing intersections and access roads which will significantly improve overall mobility and safety for the remaining turning movements and local traffic. The addition of an extra lane on Loop 410 will help eliminate the bottleneck in that area. Since the existing exit for SH 151 on southbound Loop 410 has been removed, the access road flyover on southbound Loop 410 at Military allows traffic headed to eastbound SH 151 as well as accessing the commercial areas at SH 151 and Loop 410 to bypass the signalized intersection at Military.

Work started in October 2015, and is expected to be complete in late summer 2018. The first flyover (southbound 410 to westbound 151) opened on April 14th, 2018. The second flyover (eastbound 151 to northbound 410) opened on May 5th, 2018.

Phase 2 is anticipated to start in late 2019. It is planned for this phase to include the northbound Loop 410 flyover to westbound SH 151 and the eastbound SH 151 flyover to southbound Loop 410.


  • Why did work stop for so long on the flyovers?
    After work had started, an engineering error was discovered in the plans for the long steel beams which delayed their fabrication. In the meantime, in order to prevent the overall project from being delayed, the contractor worked on other areas of the project out-of-sequence, i.e. work that was scheduled to be done after the flyovers were completed was expedited. Therefore, while this issue did delay the opening of the flyovers, it did not cause any delay in the overall completion date of the project.

  • Why is the pavement in the completed sections so rough?
    Because those sections are not yet finished. The final pavement on a project is never put down until the very end. This is to prevent damage to the pavement while construction is still underway (much like the reason carpet or flooring is the last thing installed in a new house.) Also, traffic driving on those sublayers helps to better compress and settle it before the top layer is installed.

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.

 (Note: the schematic is somewhat large and may take a few seconds to open.)

Loop 410 (Ingram to SH 151) and SH 151 (Loop 410 to Hunt) (1.90 MB)

Click on image above to see larger schematic

Other sites of interest
TxDOT - I-410 Interchange Improvements

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This page and all its contents are Copyright 2019 by Brian Purcell

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