Clark Dam, located in Woodbury County, Iowa, is a privately owned structure designed by the USDA NRCS and regulated by the Iowa DNR. Completed in 1971, this earth dam stands at a height of 39 feet and stretches 292 feet in length, creating a small reservoir with a storage capacity of 38 acre-feet. The primary purposes of Clark Dam include fire protection and serving as a stock or small fish pond, with a surface area of 2.6 acres and a drainage area of 0.42 square miles.

Despite its low hazard potential, Clark Dam is subject to regular state inspection, permitting, and enforcement to ensure its safety and compliance with regulations. The dam has an uncontrolled spillway and a moderate risk assessment rating, indicating the need for ongoing risk management measures. Although the condition assessment is currently listed as "Not Rated," the dam's risk level suggests that proactive monitoring and maintenance are essential to prevent potential hazards and ensure the continued functionality of this water resource infrastructure in Rolly Springs. For water resource and climate enthusiasts, Clark Dam provides a fascinating example of how private ownership and state regulation intersect to manage and protect vital water resources in the region.