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

This page last updated May 25, 2019


Project locationLocation
SH 151 at Loop 410

Phase 1 complete. Phase 2 planned as part of a larger project on Loop 410 currently projected to start in late 2019

Phase 1 of this $81.8 million project constructed the first two flyovers at the interchange at Loop 410 and SH 151. Specifically, this phase built the eastbound SH 151 to northbound Loop 410 and the southbound Loop 410 to westbound SH 151 connectors. In addition, Loop 410 was widened to eight lanes from Ingram to SH 151 and auxiliary lanes were added to both directions of 151 from Loop 410 to Potranco (eastbound) and Hunt (westbound.) Several ramps on Loop 410 and SH 151 were relocated to accommodate the new flyovers and to improve traffic flow. An access road flyover on southbound Loop 410 at Military was added as well as turnarounds on SH 151 at Ingram, Potranco, and Hunt.

How this project will help
This project provided new direct connections on the heaviest turn movements in the 410/151 interchange. This has removed that traffic from the pre-existing intersections and access roads has significantly improved overall mobility and safety for the remaining turning movements and local traffic. The addition of an extra lane on Loop 410 eliminated the previous bottleneck in that area. Since the existing exit for SH 151 on southbound Loop 410 had to be removed, the access road flyover on southbound Loop 410 at Military now 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 was completed in late 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 as part of a larger project on Loop 410. 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.

A detailed schematic for Phase 2 will be added soon.

Other sites of interest
TxDOT - I-410 Interchange Improvements

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