Lake Casa Blanca Dam
Lake Casa Blanca Dam is an earth dam located in Webb County, Texas, built in 1946. It carries a High hazard potential classification and has a fair condition assessment.
About Lake Casa Blanca Dam
The primary purpose of Lake Casa Blanca Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Webb County (local government). It impounds the Chacon Creek near Laredo.
The dam stands 78 feet tall and stretches 5,800 feet across, creates a reservoir covering 1,650 acres, has a maximum storage capacity of 65,000 acre-feet, and collects water from a drainage area of 117 square miles. Completed in 1946, 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 12/06/2022.
At 78 feet, this dam is taller than 97% 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 | Webb |
| Nearest City | Laredo |
| River/Stream | Chacon Creek |
| Coordinates | 27.53414, -99.44797 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 78 ft |
| Dam Height | 73 ft |
| Dam Length | 5,800 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 65,000 acre-ft |
| Max Storage | 65,000 acre-ft |
| Normal Storage | 17,480 acre-ft |
| Surface Area | 1,650 acres |
| Drainage Area | 117 sq mi |
| Max Discharge | 178,001 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | WEBB COUNTY |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 12/06/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX02267 |
| Federal ID | TX02267 |
| More Info | State Dam Safety Program |