Lewisville Dam
Lewisville Dam is an earth dam located in Denton County, Texas, built in 1955. It carries a High hazard potential classification.
About Lewisville Dam
The primary purpose of Lewisville 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 Usace - Fort Worth District (federal). It impounds the Elm Fork Of The Trinity River near Lewisville.
The dam stands 135 feet tall and stretches 32,328 feet across, creates a reservoir covering 23,280 acres, has a maximum storage capacity of 1,804,300 acre-feet, and collects water from a drainage area of 1,660 square miles. Completed in 1955, 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 02/28/2024.
At 135 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 | Denton |
| Nearest City | Lewisville |
| River/Stream | Elm Fork Of The Trinity River |
| Coordinates | 33.06932, -96.96454 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 135 ft |
| Dam Height | 130 ft |
| Dam Length | 32,328 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 1,804,300 acre-ft |
| Max Storage | 1,804,300 acre-ft |
| Normal Storage | 618,400 acre-ft |
| Surface Area | 23,280 acres |
| Drainage Area | 1,660 sq mi |
| Max Discharge | 216,800 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - Fort Worth District |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 02/28/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX00008 |
| Federal ID | TX00008 |
| More Info | State Dam Safety Program |