Road & Bridge

Important Links


  • Block House Creek Subdivision in Leander: Williamson County crews are currently trimming/pruning trees in the Block House Creek subdivision. This is in preparation for roadway resurfacing work that is scheduled to take place in the spring. Trees will be trimmed/pruned to a minimum height of 14ft. above street level and a minimum distance of 1 ft. behind the curb line or edge of pavement. All County employees have been trained and educated in the proper techniques of tree trimming and pruning. All residences where tree trimming will take place have received a green door hanger with contact information.
  • South San Gabriel Ranches Subdivision in Leander will experience daily lane closures as Williamson County moves forward with roadway rehabilitation of Baker Ln, Hawkins Dr, Jennifer Ln, Mikes Way, and Norwood Dr in the South San Gabriel Ranches Subdivision. This project will be performed by Smith Contracting.  The project is expected to begin in January and be completed in approximately seven months, weather permitting. For additional information and lane closure map, please see the Road Closures and Detours page.
  • King Lane in Leander is scheduled for rehabilitation in spring of 2024.  Weather permitting, Aqua Texas waterline improvements will be performed by Smith Contracting throughout March and completed in early April.  The King Ln roadway rehabilitation will be performed by Williamson County Road & Bridge crews starting in mid-April and lasting approximately four (4) months. All roadways will remain open to local traffic during construction activities.
  • S O'Connor Drive from SH 45 to FM 620 will experience daily lane closures from September 5, 2023 extended through February 2024 while milling and resurfacing of the roadway work is being performed. Work hours for this project are 8:00 p.m. to 6:00 a.m. The roadway will remain open for the duration of the project. For additional information and lane closure map, please see the Road Closures and Detours page.
  • For more information on current/temporary road closures in the County please see the Road Closures and Detours page for more information.

Driveway Permit and Utility Permit Processes Now Online

Williamson County has moved its Driveway and Utility Permit applications online. A Driveway Permit is required to construct a proposed driveway or modify an existing driveway connecting to a county-maintained roadway. A Utility Permit is required for any proposed utility installation within County right-of-way.

Applicants can create a free account and submit their Driveway or Utility Permit application by visiting the MyGovernment Online website. For more information, call 512-943-3330.

Driveway Permit Process

Driveway Permit Process Now Online

The Williamson County Engineer/Road and Bridge Division is now accepting Driveway Permit applications online at For more information on the application process, click Online Application Instructions-WilCo Development Permits (PDF) or watch the following video.

More online applications such as the Floodplain Development Permit and Subdivision applications will be added to in the future. Check back regularly for announcements.

Certificate of Compliance Process

Certificate of Compliance Process Now Online

The Williamson County Engineer/Road and Bridge Division is now accepting Certificate of Compliance applications online at MyGovernment Online website. For more information on the application process, click Online Application Instructions-WilCo Development Permits (PDF) or watch the following video.

County Engineer / Road and Bridge Division

One of the major functions of county government is to build and maintain a network of roads and bridges in unincorporated areas of the county. The County Engineer/Road and Bridge Division has that responsibility. Williamson County is responsible for maintaining approximately 1,400 miles of county roads spread over an area of 1,124 square miles. To learn more about what the Road and Bridge Division accomplishes in a year, click here for a fact sheet (PDF).

The County Engineer/Road and Bridge Division is also responsible for:

  • Floodplain Management
  • Enforcing of the development requirements in the Subdivision Regulations
  • Inspecting of county and subdivision road construction as well as utility installation in county right-of-way
  • Right-of-Way acquisition

Texas counties have not been given general zoning authority by the state legislature, so the County does not deal with most site plans or issue building permits except for health and safety issues handled by the Williamson County and Cities Health District. For more information, please see Documents and Forms or the answers to Frequently Asked Questions (FAQ's).

In the event that you need assistance with a plat or development, please call 512-943-3330 in advance to schedule a meeting with the county engineer, the county floodplain administrator or any member of our development team.

If you would like to submit a question or concern to the Williamson County Road and Bridge Division, you may do so by filling out this form.

Neighborhood Street Resurfacing Program

More than 530 miles of county roads are located in subdivisions and are maintained by Road and Bridge. These roads have been patched or repaired as needed, but not resealed in several years. Cracks in the roadway allow water to deteriorate the road materials that hold it together and affect its load bearing capacity. In order to ensure that our county roads are sealed and protected from deterioration due to water, Williamson County has begun a major investment in preventative maintenance of our local roads. There will be two different types of resurfacing products that will be utilized for neighborhood streets. The straight sections of roadway will receive what is called a "seal coat" (Learn more about seal coat) and the cul-de-sacs will receive what is called a "fog seal" (Learn more about fog seal). Preparation starts the year prior to scheduled resurfacing. For information on the preparation work for resurfacing, see the Resurfacing Schedule page.

Rural County Road Resurfacing Program

Rural county roads comprise approximately 63% of the County's roadway network, with approximately 850 centerline miles. Roads that do not require major maintenance need to be protected from water infiltrating the pavement structure. For this purpose, Road and Bridge utilizes a resurfacing product called a seal coat. A seal coat is a preventive maintenance surface treatment designed to preserve and extend the life of a road. It protects an aging asphalt surface and seals up the small cracks to keep water out of the pavement structure. To view more information about the Rural County Road Resurfacing Project, click Resurfacing Program page.

County Road Maintenance Program

A vast majority of CR designated county roads have little or no pavement structure beneath the surface. The pavement structure is similar to the foundation of a building or a house. Without its presence, roadways cannot withstand the daily traffic loading they receive and the soil below the surface fails. Many of these roads have received numerous patches and repairs in the past, but not a fix that meets the desirable life cycle for this classification of roadway. Williamson County has begun a major investment in the sustainable repair of our rural county road system. By analyzing the existing road conditions, we determine whether to improve, replace or construct pavement structures underneath the roadway surface on a case by case basis. To view more information about County Road Major Maintenance, see the County Road Maintenance Program. 

Bridge Replacement Program

Structures with total span lengths in excess of 20 feet are defined as bridges by the Federal Highway Administration. The State of Texas is required by Congress to inspect the load rating of all bridges every two years. For information regarding the load rating for any of the County Bridges, contact (512) 943 - 3330 or see the Bridge Replacement and Maintenance page

Signing, Striping and Delineation

Signs and pavement markings represent an important safety component of our roadway system.  For more information, see the Signing, Striping and Delineation page.