Hanson, located in Iron, Wisconsin, is a private earth dam built in 1972 by the USDA NRCS for fire protection, stock, or small fish pond purposes. This dam stands at a height of 23 feet with a hydraulic height of 18 feet, providing a storage capacity of 110 acre-feet. The dam has a surface area of 9 acres and serves a drainage area of 0.1 square miles, with a maximum discharge capacity of 20 cubic feet per second.

Managed by the WIDNR, Hanson has a low hazard potential and is rated in fair condition as of the last assessment in May 2020. Despite being uncontrolled, the spillway is designed to handle overflow events safely. The dam underwent its last inspection in August 2017, with a scheduled inspection frequency of 10 years. While the risk assessment indicates a moderate level of risk, there are currently no specific risk management measures in place.

Located in a remote area with no associated structures or nearby city, Hanson serves as an essential water resource for the surrounding area for both agricultural and emergency purposes. With its strategic location along TR ALDER CREEK-NON NAV, this dam plays a crucial role in maintaining water supply and ensuring fire protection for the region. For water resource and climate enthusiasts, Hanson represents a unique example of sustainable water management practices in a rural setting.