Mononame 64 is a privately owned earth dam located in Metz, Missouri along the TR Cottonwood Creek. Completed in 1969, this recreational structure stands at a height of 19 feet and has a storage capacity of 102 acre-feet, with a normal storage level of 44 acre-feet. With a surface area of 10 acres and a drainage area of 93 square miles, Mononame 64 serves as a low hazard potential dam, rated as "Not Rated" in terms of its condition assessment.

Despite being privately owned, Mononame 64 does not fall under state regulation, permitting, inspection, or enforcement. The dam is primarily utilized for recreational purposes and is not associated with any federal agencies for funding, construction, or oversight. While its emergency action plan status and risk management measures remain undisclosed, its risk assessment and inundation maps are also pending. Situated in Vernon County, Missouri, Mononame 64 provides a serene backdrop for water resource and climate enthusiasts to appreciate the beauty and importance of our natural landscapes.