Rendering of the completed dam
Old Lampasas Dam Modernization
March 2026 Construction Update
The slide gate at the Old Lampasas Dam was installed last month. The slide gate will help control water flow through the dam's outlet. Backfilling for the principal spillway's and the access road behind the dam were completed as well.
Crews are currently digging a trench to install a geogrid, which reinforces and stabilizes soil on the dam structure. Work is also underway constructing the dam's upstream face and laying concrete for the dam's inlet and outlet structures. Ground anchor installation is anticipated to be completed by next month.
Completed Work:
- Slide gate installation
- Backfilling for the principal spillway's subgrade
- Wastewater line installation
- Subgrade for access road
Current Work:
- Ground anchor installation and casing
- Inlet and outlet structure concrete
- Upstream face construction
Auxiliary Spillway and Ground Anchor 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 summer 2026, weather permitting.
Primary Spillway
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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