Rendering of the completed dam
Old Lampasas Dam Modernization
September 2026 Construction Update
Crews have been working to complete the Old Lampasas Dam's auxiliary spillway. Some of the final touches include forming the spillway's walls and installing concrete baffles, which are structures that help reduce the force of flowing water exiting the dam.
In addition to work on the auxiliary spillway, crews have completed installation of the geogrid on the dam's upstream face. A geogrid is a grid-like structure used to reinforce soil and help it resist deformation, which both strengthens the dam and extends its service life. Work is also underway to connect the maintenance road to the dam.
Completed Work:
- Upstream dam face geogrid installation
Current Work:
- Auxiliary spillway construction
- Inlet and outlet structure concrete
- Maintenance road access construction
Concrete baffle construction
Auxiliary spillway wall 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 late 2026, weather permitting.
Reminders and Timeline
- This is an active construction site. For the safety of the public, unauthorized entry is not permitted.
- Construction hours adhere to the City's Noise Ordinance.
- Please note that as with any construction project, schedules are projected as accurately as possible, and all dates are subject to change due to the nature of construction and weather.
For more information, email CapitalDelivery@AustinTexas.gov
Visit us online at AustinTexas.gov/department/old-lampasas-dam-modernization
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