Rendering of the completed dam
Old Lampasas Dam Modernization
October 2025 Construction Update
Backfill activity on the principal and auxiliary spillways continued throughout the month. Next month, crews will begin to install a riser for the dam's retaining wall. Installation of ground anchors along the auxiliary spillway is also planned to commence.
Completed Work:
- The principal spillway has been backfilled to cofferdam level
- The cofferdam has been removed
- The concrete base level layer and cap has been placed on the auxiliary spillway
Current Work:
Principal Spillway
Auxiliary Spillway
Primary spillway backfill activity
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.
Auxiliary spillway backfill activity
Reminders and Timeline
Crews have recently discovered graffiti on the Old Lampasas Dam Modernization construction site and are in the process of cleaning it up. This is an active construction site and access to the work area is strictly limited to authorized personnel only. Unauthorized access presents a safety hazard for individuals walking the site without appropriate protective equipment and supervision. We thank the community for their patience as we strive for a safe and swift construction phase.
- 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
| 
