Twin Lakes Dam

About Twin Lakes Dam

The primary purpose of Twin Lakes Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Williamson County (local government). It impounds the Buttercup Creek near Cedar Park.

The dam stands 26 feet tall and stretches 625 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 305 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1972, the structure is well into its service life at over 50 years old.

This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 07/08/2020.

Living Downstream

If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Texas dam safety program can provide more specific information about emergency planning for this structure.

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