Rendering of the finished dam
Old Lampasas Dam Modernization
June 2025 Construction Update
Excavation for the Old Lampasas Dam Modernization is wrapping up this month, along with transportation of excavated material for reuse in other construction projects around the City. Installation of the underdrain has begun and will continue over the next several weeks. Next month, crews will also begin installation of the primary spillway pipe.
Completed Tasks:
- Excavation
- Approximately 140,000 cubic yards of rock material in total were transported for reuse in various City facilities and projects
- Over 80 feet of backfill to date has been poured
Upcoming Work:
- Construction of the primary outlet structure
- Underdrain installation
- Primary spillway pipe installation
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.
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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