Austin Water has completed the Preliminary Engineering Report (PER) for the Williamson Creek Interceptor Project and is currently progressing the design to 60%. Construction is projected to begin in 2021; however, staff from the City of Austin's Public Works Department and Austin Water are continuing to meet with neighbors in the project vicinity to discuss potential project impacts, route options, and the overall project purpose.

Project Scope

  • Installation of approximately 18,000 linear feet of a 66-inch diameter gravity interceptor along Williamson Creek from South First St. to Pleasant Valley Rd.
  • The new interceptor will remove as much of the existing 48” line from service as possible and relieve a bottleneck in the existing line.

Project Area 

The project area is from southeast Austin near Onion Creek and William Cannon and continues northwest along Williamson Creek to the existing interceptor at South First Street. 

Design Time Frame 

November 2017 – March 2021

(Dates are projected as accurately as possible, but are subject to change.) 


During the design process there will be opportunities for the public and stakeholders to provide comment. When we approach construction, we will meet with the community again to discuss the timeline, phasing, construction implications, any effect on traffic patterns, etc. We will also update this page with any pertinent information and upcoming community meetings. If you have any questions in the meantime, please contact a member of our staff. 

Upcoming Meetings 

At completion of the 60% design (around June 2020), City staff will schedule meetings with neighborhood groups.

Nov. 13, 2017, 6:30 – 7:30 p.m.
Dove Springs Recreation Center
5801 Ainez Dr, Austin, TX 78744 (map

Nov. 15, 2017, 6:00 – 7:00 p.m. 
Pleasant Hill Library
211 E William Cannon Dr, Austin, TX 78745 (map)

Meeting Presentation


Eric Bailey, Project Manager
Public Works

Emlea Chanslor, Public Information
Austin Water