State Highway 123 through Seguin is on deck for a major face-lift, with the Texas Department of Transportation registering a roughly $47.3 million plan to widen the busy corridor between Cordova Road and Interstate 10. The two-lane stretch is slated to become a four-lane corridor with a raised median, sidewalks and space for bike access. The registration, filed March 23, 2026, lists an October 1, 2026 construction start and a June 22, 2029 completion target, with TxDOT framing the work as an upgrade to a busy connector that funnels traffic between Seguin and regional highways.
Project snapshot
According to TDLR, the registration for SH 123 (CSJ: 0366-02-089) lists an estimated cost of $47,292,024 and identifies a start date of October 1, 2026 and a planned completion date of June 22, 2029. The filing names TxDOT's San Antonio District as the owner and Jacobs Engineering Group as the design firm. The record classifies the work as new construction funded with public dollars.
Design and pedestrian upgrades
As outlined by TxDOT, the plan would widen SH 123 to two 12-foot travel lanes in each direction separated by a raised median, add five-foot shoulders and six-foot sidewalks, and preserve room for bicycle access. Within the project limits, the roadway today is typically an undivided two-lane highway with wider outside shoulders. Schematics from the project's public materials show how medians and sidewalks can be fitted into the available corridor footprint.
Right-of-way and neighborhood impact
As reported by MySA, TxDOT says the existing right-of-way through the project generally ranges from about 140 to 220 feet. While some additional right-of-way will be needed, officials do not anticipate homes or businesses being displaced, a point reflected in previously released project materials. Property owners in the corridor were notified during earlier outreach and were directed to project contacts for relocation and acquisition information.
Where this fits in local plans
According to TxDOT public meeting materials from 2022, the SH 123 schematic was presented in March 2022 during a virtual meeting and an in-person open house in Seguin, underscoring the project's multi-year development. The meeting materials and technical reports filed with that outreach outline the same lane, shoulder and sidewalk standards now listed in the registration. The SH 123 work also arrives amid a spate of local investment in Seguin's streets, including roughly $30 million in recent federal awards to expand sidewalks and shared paths, as reported in a story on federal cash for Seguin streets.
What drivers should expect
Drivers along SH 123 should expect intermittent lane closures, traffic switches and detours once work begins. For context, KSAT reported that TxDOT closed I-10 main lanes in Seguin during construction work in October 2025, illustrating the kinds of traffic impacts that can accompany major corridor upgrades. TxDOT typically posts detours and traffic alerts before major lane reductions.
Next steps
With the project registration filed on March 23, 2026, the work is formally logged and the agency will move toward final design, letting and construction. Per the TDLR registration, the file lists Jeb Smith, P.E., as a TxDOT contact and identifies Frank Fonseca as the registered accessibility specialist. Contact and schematic materials are available in the public record for review. We will track permitting and the letting schedule as TxDOT publishes updates ahead of the planned October 1, 2026 start.
