Corridor H / Sam Bass Road

Location: Sam Bass Road from RM 1431 to Wyoming Springs Drive (also known as Corridor H) in Precinct 1 and 3.

Overview: Williamson County is planning to widen Sam Bass Road between RM 1431 and Wyoming Springs Drive to enhance safety, improve mobility, and meet current and future traffic needs as the county continues to grow. The Corridor H / Sam Bass Road Project includes reconstructing Sam Bass Road as a three-lane roadway with a continuous center-turn lane and shoulders, adding a shared-use path for bicyclists and pedestrians, and making intersection improvements. Construction funding for the first interim phase of improvements has been identified as part of the voter-approved 2019 Williamson County Road Bond Program. View the current project layout (PDF)

Status: Interim traffic signal improvements have been completed at the intersections with RM 1431, Walsh Ranch Boulevard and Great Oaks Drive. Construction began in spring 2023 and is anticipated to be completed in mid-2025. Sign up for construction updates by filling out this form..

Future Expansion: Paired with intersection improvements, the County's plan for a three-lane roadway is expected to address existing travel needs. However, growth projections and traffic models suggest that additional capacity will be needed in the future. The current schematic for the roadway allows for future expansion to six lanes, consistent with the City of Round Rock's Transportation Plan and the Williamson County Long-Range Transportation Plan.

While the County has prepared the ultimate roadway schematic for Sam Bass Road, additional lanes will not be built until the need arises and funding becomes available for ROW acquisition and construction. There is currently no timeline or funding identified for the ultimate six-lane expansion.

View the Ultimate Schematic (PDF).

Contact the commissioner

Materials and Documents


May 17, 2018 Public Meeting 

June 21, 2017 Public Meeting

Williamson County Long-Range Transportation Plan

Public Involvement

Williamson County wants to hear from you, and public input is encouraged at any time. For more information or to schedule a meeting with the study team, please reach out:

Email: Roads Department

Call: 512-943-1195 (leave a message to request a call back within 48 hours)

Mail: 
Williamson County Public Information Office
710 S Main Street
Suite 101
Georgetown, TX 78626

Updates: Sign up for construction updates.

Project Map

Corridor H Sam Bass Study Area