Molkenthin Dam, located in Ollie, Iowa, is a private dam built in 1975 by USDA NRCS for the primary purpose of recreation. The dam stands at 30 feet tall and spans 412 feet in length, with a storage capacity of 108 acre-feet. Situated on the TR-South Skunk River, the dam has a surface area of 7.3 acres and drains a watershed area of 0.23 square miles.

Managed by the Iowa DNR, Molkenthin Dam is regulated, inspected, and enforced by the state. Classified as having a low hazard potential, the dam is currently rated as "Not Rated" in terms of its condition assessment. Despite its moderate risk level, the dam does not have an Emergency Action Plan in place. With a spillway type of "Uncontrolled," the dam serves as a vital resource for fire protection, stock, and small fish pond purposes in addition to its recreational use. For water resource and climate enthusiasts, Molkenthin Dam offers a fascinating case study of a privately owned structure with important implications for environmental management and conservation efforts.