Ohnemus Dam, located in Red Rock Reservoir, Iowa, was completed in 1965 by the USDA NRCS and is privately owned. The dam serves multiple purposes including fire protection, stock, and small fish pond management. With a height of 25 feet and a length of 280 feet, the dam has a normal storage capacity of 24 acre-feet and a maximum storage of 55 acre-feet. It is classified as an Earth dam with a spillway type of Uncontrolled and a hazard potential rated as Low.

Despite being privately owned, Ohnemus Dam is regulated by the Iowa DNR and undergoes state permitting, inspection, and enforcement. The dam is located on TR- Flank Creek and serves as an important water resource within the region, with a drainage area of 0.22 square miles and a surface area of 3.3 acres. The risk assessment for the dam is categorized as Moderate, indicating a moderate level of risk associated with its operation and maintenance.

Overall, Ohnemus Dam is a key infrastructure for water management in Warren County, Iowa, providing essential functions for fire protection and agriculture. Its low hazard potential and moderate risk assessment highlight the importance of continued monitoring and maintenance to ensure its safety and efficacy in managing water resources in the area.