Donora Settling is a privately owned tailings dam located in St. Louis County, Minnesota. Completed in 1970, this earth dam stands at a height of 20 feet and has a structural height of 32 feet, with a length of 7000 feet. The dam has a capacity of storing 1145 acre-feet of water, with a normal storage level of 800 acre-feet.

Despite being offstream, Donora Settling poses a low hazard potential and has been assessed as satisfactory in condition. The last inspection in 2014 found the dam to be in good standing, with an inspection frequency of 8 years. The dam is not regulated by the state and has no state jurisdiction, permitting, inspection, or enforcement.

With its primary purpose being the containment of tailings, Donora Settling serves an important function in managing mining waste in the area. Although it is privately owned and not under federal agency oversight, the dam plays a crucial role in environmental protection and water resource management for the local residents.