Lewisville Dam, located in Denton, Texas, along the Elm Fork of the Trinity River, serves as a crucial flood risk reduction infrastructure designed by the US Army Corps of Engineers. Completed in 1955, the dam stands at 130 feet high and spans 32,328 feet in length, with a primary purpose of flood risk reduction. Despite its effectiveness in reducing downstream flooding, a risk assessment conducted in October 2014 identified the dam as having a high hazard potential, particularly during extreme flood events that could lead to a breach or large flows over the spillway, impacting communities downstream such as Lewisville, Coppell, Carrollton, Farmers Branch, Irving, and Dallas.

To address the identified deficiencies and reduce the risk associated with the dam, the US Army Corps of Engineers has implemented various risk management measures. These include working closely with local emergency managers to develop evacuation plans, regularly updating the emergency action plan, conducting emergency exercises, and ongoing inspections and maintenance of the dam. Furthermore, construction is underway for dam safety modifications, such as building a downstream inverted filter berm, anchoring the spillway weir, and constructing a barrier wall downstream of the spillway to enhance the dam's structural integrity and reduce the risk of failure. Despite the remote probability of failure, efforts are ongoing to safeguard the dam and surrounding communities from potential catastrophic impacts.