Hansen Farms Dam, located in Diagonal, Iowa, serves multiple purposes including fire protection, stock, and small fish pond management. Constructed in 2001 by the NRCS, this earth dam stands at a height of 30 feet with a length of 423 feet, providing a storage capacity of 83 acre-feet. Situated on TR-Indian Creek, the dam is state-regulated, inspected, and enforced by the Iowa DNR, ensuring its safety and compliance with regulations.

With a low hazard potential and a moderate risk assessment rating, Hansen Farms Dam is a vital water resource for the Ringgold County community. The dam's design includes a stone core and soil foundation, with a spillway type classified as uncontrolled. Despite not having outlet gates or locks, the dam's normal storage capacity of 53 acre-feet and surface area of 5.8 acres support its intended functions effectively.

Managed by private owners, Hansen Farms Dam plays a crucial role in water management and conservation efforts in the region. As a significant structure along the Indian Creek tributary, the dam's construction and operation align with environmental and safety guidelines, contributing to the sustainable use of water resources for agricultural, recreational, and emergency purposes in the area.