Van Donselar Dam, located in Lake Keomah State Park in Mahaska County, Iowa, is a privately owned structure designed by the USDA NRCS and regulated by the Iowa DNR. Completed in 1998, this earth dam stands at a height of 30 feet and has a length of 372 feet, providing storage for fire protection, stock, or small fish pond purposes. The dam has a low hazard potential with a moderate risk assessment rating, making it an essential resource for water management in the area.

With a normal storage capacity of 69 acre-feet and a total storage of 120 acre-feet, Van Donselar Dam plays a crucial role in controlling water flow on the TR-South Skunk River. The dam's spillway type is uncontrolled, and it covers a surface area of 8.4 acres with a drainage area of 0.34 square miles. Although the dam has not been rated for condition assessment, it meets the necessary regulatory requirements for inspection, enforcement, and permitting, ensuring its operational efficiency and safety.

Managed by the Natural Resources Conservation Service, Van Donselar Dam remains a vital infrastructure for water resource and climate enthusiasts in the region. Its strategic location, design, and purpose contribute to the sustainable utilization of water for various needs while minimizing the risk of potential hazards. As a key component of the local water management system, the dam continues to play a significant role in enhancing environmental resilience and supporting the community's water supply needs.