Hammer Dam, located in Fort Dodge, Iowa, is a privately owned earth dam designed by the USDA NRCS in 1973. Primarily used for fire protection, stock, and small fish pond purposes, this dam stands at a height of 50 feet with a length of 330 feet, providing a storage capacity of 72 acre-feet. Situated on the West Branch Lizard River, this low hazard potential dam serves as a recreational spot for water resource and climate enthusiasts in the area.

Managed by the Iowa DNR, Hammer Dam is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and compliance with regulations. Despite being uncontrolled, the dam has a moderate risk assessment with a risk management plan in place. Over the years, the dam has not been modified, and its condition is currently not rated, although it meets the guidelines for emergency action plans. With its picturesque location and moderate risk level, Hammer Dam continues to be a vital water resource for the community while offering recreational opportunities for visitors.