Twin Lakes Dam No 1

About Twin Lakes Dam No 1

The primary purpose of Twin Lakes Dam No 1 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Great Southern Realty Company (private). It impounds the Tr-bandera Creek near Bandera.

The dam stands 21 feet tall and stretches 730 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 121 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1948, the structure is well-established, with more than 75 years of service.

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 06/25/2024.

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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