Austin Watershed Protection

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Brassiewood Local Flooding

Equipment lifting box culvert into open trench in the road

Williamson Creek

Project Overview

This project will reduce the risk of flooding of homes, yards and streets through an upgraded storm drain system that includes detention pond improvements, upgraded storm drain pipe and new storm drain inlets. The original storm drain system in the Brassiewood Drive area was designed and constructed using outdated drainage criteria and is not able to handle large rain events. Homes and streets sometimes flood during heavy rainfall.

This multi-phase project builds on work done in 2021 and 2025 to increase the capacity of the storm drain system and improve drainage.

Status

Phase 2 will start in July 2026. Work on phase 1 is mostly complete.

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Upcoming Construction

Phase 2: South Pleasant Valley Road Outfall

This phase will enlarge the detention pond outlet at Aviary Cove and construct a new storm drain along Pleasant Valley Road. The new outlet will capture more stormwater and lower the risk of the pond overtopping. This outlet will connect to a new storm drain system along Pleasant Valley Drive, which will convey the stormwater from the pond into Williamson Creek near the Pleasant Valley Bridge to the south. (CIP ID: 5789.144)

Austin City Council authorized the construction contract on May 7, 2026. Construction is anticipated to start in July 2026.

Key Contacts for Phase 2

In Progress

Phase 1 - Brassiewood Dr. and Creekwood Dr. Storm Drain Improvements

Phase 1 includes a new storm drain line that runs along Softwood Drive and Creek Bend Drive before reaching the outfall just east of the existing flood wall into Williamson Creek. This captures a significant portion of the stormwater that previously flowed into the detention pond at the end of Aviary Cove. Construction cost is estimated at $2,253,322. (CIP ID: 5789.131)

May 2026: There are a few tasks remaining for Phase 1, which is expected to be complete in May 2026, weather permitting.

Map of existing and proposed storm drains
Map of existing and proposed storm drains
Phase 1: What to Expect During Construction

For your safety, please stay aware of safety fencing and signage and keep children and pets away from construction and equipment.

  • Work will be between 7 a.m. and 7 p.m. on weekdays and potentially some weekends.
  • Portions of streets may be closed during construction, but you will have access to your home. Allow an extra 15 minutes to enter and exit your driveway.
  • Cars will be towed to a nearby street if they are in active construction areas or blocking access to a staging area.
  • We are coordinating with the Neighborhood Partnering Program to ensure safe and accessible trails during construction.
  • There is always the potential for temporary, unexpected disruptions to services such as gas, water, electricity or cable. We will take care to avoid this.
Phase 1: Key Contacts

Future Phases

Phase 3: Neighborhood Storm Drain Improvements

Phase 3 of the project will include general improvements to the stormwater infrastructure throughout the neighborhood, including inlet improvements, channel improvements, and bridge culvert improvements. This project is in the Preliminary Engineering (PER) phase to study options to further reduce the risk of flooding in the neighborhood. We recently received the Preliminary Engineering Report and expect design to be complete by fall 2027, depending on the availability of funding. (CIP ID: 5789.145)

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