Located in Jefferson County, Iowa, the Roadgrade Dam 24-72-11, also known as the Big Cedar Creek Dam, was completed in 1984 by the USDA NRCS. This earth dam stands at a height of 25 feet and spans 800 feet in length, with a storage capacity of 64 acre-feet for flood control purposes. The dam is regulated by the Iowa Department of Natural Resources and is inspected regularly to ensure its structural integrity and safety.

Despite its low hazard potential, the Roadgrade Dam plays a crucial role in managing the flow of the TR- Big Cedar Creek, protecting the surrounding area from potential flooding. The dam has a moderate risk assessment rating, indicating that it is adequately maintained and managed to mitigate any potential risks. With a surface area of 3.3 acres and a drainage area of 0.21 square miles, the dam serves as a vital infrastructure for water resource management in the region.

Owned by the local government, the Roadgrade Dam 24-72-11 serves as a key component of the water management system in Jefferson County. With its uncontrolled spillway and soil foundation, the dam is designed to withstand various hydraulic pressures and provide essential flood protection for the community of Big Cedar Creek. Climate and water resource enthusiasts can appreciate the strategic design and maintenance efforts put into this critical infrastructure for ensuring the safety and well-being of the surrounding area.