Twin Buttes Dam
Twin Buttes Dam is an earth dam located in Tom Green County, Texas, built in 1963. It carries a High hazard potential classification.
About Twin Buttes Dam
The primary purpose of Twin Buttes Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Bureau Of Reclamation (federal). It impounds the Mid & So Concho Riv, Spring Cr near San Angelo.
The dam stands 134 feet tall and stretches 42,460 feet across, creates a reservoir covering 23,508 acres, has a maximum storage capacity of 1,088,152 acre-feet, and collects water from a drainage area of 3,969 square miles. Completed in 1963, 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 03/01/2022.
At 134 feet, this dam is taller than 99% of all dams in the United States.
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 | Tom Green |
| Nearest City | San Angelo |
| River/Stream | Mid & So Concho Riv, Spring Cr |
| Coordinates | 31.36560, -100.52840 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 134 ft |
| Dam Height | 134 ft |
| Dam Length | 42,460 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 1,088,152 acre-ft |
| Max Storage | 1,088,152 acre-ft |
| Normal Storage | 186,210 acre-ft |
| Surface Area | 23,508 acres |
| Drainage Area | 3,969 sq mi |
| Max Discharge | 47,300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 03/01/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX00022 |
| Federal ID | TX00022 |
| More Info | State Dam Safety Program |