Nasworthy Dam
Nasworthy Dam is an earth dam located in Tom Green County, Texas, built in 1930. It carries a High hazard potential classification and has a fair condition assessment.
About Nasworthy Dam
The primary purpose of Nasworthy Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of San Angelo (local government). It impounds the South Concho River near San Angelo.
The dam stands 47 feet tall and stretches 5,480 feet across, creates a reservoir covering 1,380 acres, has a maximum storage capacity of 32,981 acre-feet, and collects water from a drainage area of 2,881 square miles. Completed in 1930, 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 05/08/2023.
At 47 feet, this dam is taller than 92% 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 | Tom Green |
| Nearest City | San Angelo |
| River/Stream | South Concho River |
| Coordinates | 31.38818, -100.47803 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Height | 47 ft |
| Dam Length | 5,480 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 32,981 acre-ft |
| Max Storage | 32,981 acre-ft |
| Normal Storage | 10,108 acre-ft |
| Surface Area | 1,380 acres |
| Drainage Area | 2,881 sq mi |
| Max Discharge | 228,724 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF SAN ANGELO |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 05/08/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX03139 |
| Federal ID | TX03139 |
| More Info | State Dam Safety Program |