Garrison Ranch Lake Dam
Garrison Ranch Lake Dam is an earth dam located in Bandera County, Texas, built in 1957. It carries a High hazard potential classification.
About Garrison Ranch Lake Dam
Garrison Ranch Lake Dam is a dam in Bandera, Texas. The dam is owned by George Yax;trails End Ranch (private). It impounds the West Prong Medina River near Medina.
The dam stands 38 feet tall and stretches 850 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 680 acre-feet, and collects water from a drainage area of 42 square miles. Completed in 1957, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 02/21/2019. That was 7 years ago, which is on the longer end for a high-hazard structure.
At 38 feet, this dam is taller than 85% of dams nationwide.
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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Texas |
| County | Bandera |
| Nearest City | Medina |
| River/Stream | West Prong Medina River |
| Coordinates | 29.78180, -99.33763 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 850 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 680 acre-ft |
| Max Storage | 680 acre-ft |
| Normal Storage | 162 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 42 sq mi |
| Max Discharge | 79,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | GEORGE YAX;TRAILS END RANCH |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not Rated |
| Last Inspection | 02/21/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX02909 |
| Federal ID | TX02909 |
| More Info | State Dam Safety Program |