Rendering of the completed dam
Old Lampasas Dam Modernization
May 2026 Construction Update
The placement of riprap (large rocks) where water leaves the Old Lampasas Dam has been completed. Work also continued on the auxiliary spillway, which included rebar placement, installation of concrete forms, and ground anchor grouting.
Over the next month, crews will continue installing reinforced concrete for the inlet and outlet structures of the dam facility, as well as the auxiliary spillway. Crews will also continue maintenance access road construction and start planning revegetation of the site as construction nears its anticipated completion.
Completed Work:
- Excavation and riprap placement for water discharge retention structure
- Auxiliary spillway rebar and concrete form installation
- Ground anchor grouting
Current Work:
- Auxiliary spillway construction
- Inlet and outlet structure concrete
- Maintenance access road construction
- Revegetation
Auxiliary spillway construction
Bottom view of auxiliary spillway
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 summer 2026, weather permitting.
Maintenance access road construction
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
| 
