Williamson County Corridor H / Sam Bass Road Expansion

Williamson County is home to some of the fastest growing cities in Texas. To address the rapid growth, expansion of Corridor H / Sam Bass Road is necessary to enhance safety, improve mobility, and meet current and future traffic needs.

Corridor H consists of Sam Bass Road from Wyoming Springs Blvd to FM 1431 in Round Rock, TX. The existing roadway is a two-lane facility and is ultimately programmed to be a six-lane arterial. Our team was selected to perform corridor planning, public involvement and schematic design for right of way determination as part of the county’s corridor program.

As part of the corridor study, our team met with property owners to hear concerns and gather feedback on safety and mobility issues on the roadway. We worked with the County GEC to coordinate long range travel demand modeling and existing and future Level of Service (LOS) analyses for the Corridor. In collaboration with County and GEC, our team prepared a recommendation to construct a three-lane roadway with intersection improvements at four locations. The recommendation constructs half of the ultimate roadway while providing for right of way preservation for future phases. Our team presented the recommendation to County staff and the County Commissioner before presenting to impacted adjacent property owners. The recommendation was then presented to the community at-large at an open house.

Our team coordinated the topographic survey as well as geotechnical and environmental investigations along the corridor. Finally, a schematic was prepared for both the near term and future phases for the purpose of right of way acquisition and preservation.