Lomas Del Sur Detention Pond Dam is an earth dam located in Webb County, Texas, built in 1911. It carries a High hazard potential classification.
Dam profile
NID height · 13 ft13 ft tall and 2,800 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Lomas Del Sur Detention Pond Dam
The primary purpose of Lomas Del Sur Detention Pond 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 Als Laredo Holdings LLC (private). It impounds the Tr-rio Grande near Laredo.
The dam stands 13 feet tall and stretches 2,800 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 97 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1911, the structure is over a century 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. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 06/01/1978. That was 48 years ago — unusually long for a high-hazard dam, which typically requires more frequent inspections.
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 | Webb |
| Nearest City | Laredo |
| River/Stream | Tr-rio Grande |
| Coordinates | 27.46724, -99.46083 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 2,800 ft |
| Year Completed | 1911 (115 years old) |
Storage & Hydraulics
| NID Storage | 97 acre-ft |
| Max Storage | 97 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Als Laredo Holdings LLC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 06/01/1978 |
| Emergency Action Plan | No |
Identifiers
| NID ID | TX02255 |
| Federal ID | TX02255 |
| More Info | State Dam Safety Program |