Reservoir No. 6, located in Pengilly, Minnesota, is a privately owned dam with a primary purpose of tailings management. Completed in 1966, this earth dam stands at a height of 35 feet and has a structural height of 40 feet. With a storage capacity of 3500 acre-feet and a normal storage level of 2600 acre-feet, Reservoir No. 6 plays a crucial role in managing water resources in the area.

Managed by the Minnesota Department of Natural Resources, Reservoir No. 6 is inspected regularly to ensure its safety and functionality. With a low hazard potential and a satisfactory condition assessment, this dam provides essential water storage for the surrounding community. The dam is situated on O'Brien Creek-TR, with a drainage area of 0.4 square miles, highlighting its importance in regulating water flow and preventing downstream flooding.

Despite its private ownership, Reservoir No. 6 serves a vital public purpose by safeguarding against potential hazards and contributing to water resource management efforts in Itasca County, Minnesota. As a key infrastructure component in the region, this dam exemplifies the intersection of water resource management and climate resilience, showcasing the importance of sustainable water infrastructure in adapting to changing environmental conditions.