Rendering of the finished dam
Old Lampasas Dam Modernization
August 2025 Construction Update
This month, backfill on the auxiliary spillway of the Old Lampasas Dam Modernization project was completed, allowing for subgrade placement to begin. Another section of the primary spillway's outlet pipe was also completed along with another five feet of the inlet structure. The temporary wastewater line has been switched to the permanent connection. Next month, the inlet structure is expected to be fully placed, allowing backfill over the structure to begin.
Completed Work:
- Auxiliary spillway backfill
- A section of the primary spillway's outlet pipe
- Five feet of the inlet structure
Current Work:
- Primary spillway pipe installation
- Auxiliary spillway subgrade placement
- Inlet structure installation
Upcoming Work:
Primary spillway construction
Project Background
Built in 1984, the Old Lampasas Dam is a high-risk dam that is in poor condition and was significantly damaged during Tropical Storm Hermine in 2010. This project will repair the dam, bring it into compliance with Texas Commission on Environmental Quality (TCEQ) safety regulations, reduce flood risks in the neighborhood, and improve water quality in Bull Creek. Construction for the Old Lampasas Dam Modernization project began in October 2024 and is anticipated to reach substantial completion by spring 2026, weather permitting.
Auxiliary spillway construction (rear)
Reminders and Timeline
- The construction site is for authorized personnel only
- City of Austin permitted construction hours are:
- Monday – Friday, 7 a.m. – 7 p.m.
- Saturday, 8 a.m. – 7 p.m.
- The project team will notify neighborhoods in advance of any weekend work
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