Fann Detention, also known as N&H Acres, is a private-owned earth dam located in Fillmore County, Minnesota. Built by the NRCS in 1993, this structure serves the primary purpose of flood risk reduction along the Root River. Standing at a height of 30 feet and a length of 350 feet, Fann Detention has a storage capacity of 24.3 acre-feet and a maximum discharge of 200 cubic feet per second.

Managed by the Minnesota Department of Natural Resources, Fann Detention has a low hazard potential and is considered to be in satisfactory condition as of its last inspection in June 2017. With a moderate risk assessment rating, this dam is equipped with uncontrolled spillways and gates. Despite its age, the structure continues to play a crucial role in mitigating flood risks in the region, ensuring the safety of nearby communities like Rushford.

As a vital component of flood risk management in Fillmore County, Fann Detention stands as a testament to effective infrastructure design and maintenance. With its strategic location and design features, this earth dam remains a key asset in safeguarding the local environment and residents from potential water-related hazards. Climate enthusiasts and water resource professionals alike can appreciate the significance of Fann Detention in preserving the natural landscape and enhancing resilience to changing weather patterns in Minnesota.