Lake Ellis Dam, located in Red Rock Reservoir in Lucas County, Iowa, is a significant structure designed by Howard R. Green Co. Completed in 1993, this earth dam stands at a height of 38 feet and spans 900 feet in length, serving primarily for water supply purposes. The dam has a normal storage capacity of 803 acre-feet, with a maximum storage of 1463 acre-feet and a surface area of 80 acres.

Managed by the Iowa Department of Natural Resources, Lake Ellis Dam is subject to regular inspections and enforcement to ensure its satisfactory condition and to mitigate any potential risks. With a significant hazard potential and a moderate risk assessment rating, the dam plays a crucial role in water resource management and flood control for the Little Whitebreast Creek. Despite its uncontrolled spillway type, the dam's structure and design meet regulatory standards to safeguard the surrounding area from potential emergencies.

Enthusiasts of water resources and climate in the region can appreciate Lake Ellis Dam for its essential role in providing water supply and recreational opportunities, while also recognizing the importance of ongoing maintenance and risk management to ensure the safety and integrity of this vital infrastructure in Lucas County, Iowa.