Dennis Koenig Dam, located in Volney, Iowa, is a privately owned structure designed by USDA NRCS and completed in 2013. This Earth-type dam serves multiple purposes including grade stabilization, fish and wildlife pond creation, and recreation. With a height of 28 feet and a length of 427 feet, the dam has a storage capacity of 115 acre-feet and covers a surface area of 4.6 acres.

Situated on a tributary to the Yellow River, Dennis Koenig Dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its safety and efficacy. The dam's spillway is uncontrolled with a width of 12 feet, and it has a low hazard potential with a moderate risk assessment rating of 3. While the dam's condition assessment is currently not rated, it meets regulatory guidelines and is equipped with emergency action preparedness measures.

Water resource and climate enthusiasts will appreciate the strategic location and design of Dennis Koenig Dam, which not only enhances the local ecosystem and recreational opportunities but also contributes to grade stabilization and flood control efforts. Its collaborative ownership and state oversight ensure its continued functionality and safety, making it a valuable asset in water resource management in Winneshiek County, Iowa.