Plotz Dam, located in Johnson County, Iowa, is a privately owned earth dam with a primary purpose of recreation. Completed in 1968 by the USDA NRCS, this dam stands at a height of 28 feet and stretches 287 feet in length, creating a reservoir with a storage capacity of 44 acre-feet. The dam is situated on the TR-Knapp Creek, within the Coralville Reservoir area, providing a serene setting for water and climate enthusiasts to enjoy various recreational activities.

With a low hazard potential and a moderate risk assessment rating, Plotz Dam is regulated by the Iowa Department of Natural Resources, ensuring that it meets necessary safety standards. The dam does not have outlet gates or locks but features an uncontrolled spillway. The surrounding area boasts a surface area of 3.8 square miles and a drainage area of 0.3 square miles, offering a picturesque environment for visitors to explore and appreciate the intersection of water resources and climate within the region.

While the condition of Plotz Dam is currently not rated, its overall risk management measures are deemed satisfactory, providing a level of assurance to those who frequent the reservoir. With its tranquil waters and scenic surroundings, Plotz Dam serves as a valuable recreational resource within the community, inviting water resource and climate enthusiasts to experience the beauty and importance of sustainable water management practices in action.