Rendering of the completed dam
Old Lampasas Dam Modernization
December 2025 Construction Update
This month, crews began installation of the ground anchors, which will help stabilize the Old Lampasas Dam. This work is anticipated to continue until spring 2026. Community members are advised to expect increased noise during regular construction hours.
Construction will close for the holidays on Monday, December 23 and resume on Monday, January 5. Please call 311 if during this time you notice any unauthorized individuals on the construction site.
Completed Work:
- Test anchors were drilled and installed
- The principal spillway's strip drain was installed
Current Work:
- Ground anchor installation
- Continuing backfill up to the original dam's elevation
- Sewer line work to begin in the new year
Ground Anchor 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.
Principal Spillway Construction
Reminders and Timeline
- The construction site is open to 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
For more information, email CapitalDelivery@AustinTexas.gov
Visit us online at AustinTexas.gov/department/old-lampasas-dam-modernization
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