Located in Norman County, Minnesota, Boreen Lower, also known as Skull Lake, is a privately owned recreational dam designed by the USDA NRCS. This earth dam, completed in 1971, stands at 7 feet tall and spans 525 feet across the Wild Rice River-Tr. With a storage capacity of 113 acre-feet and a surface area of 7 acres, the dam serves primarily for recreational purposes and is regulated by the Minnesota Department of Natural Resources.

Despite its low hazard potential and satisfactory condition assessment, Boreen Lower is subject to regular state inspections and enforcement measures to ensure its safety and functionality. The dam features an uncontrolled spillway with a width of 50 feet and outlet gates for water release. In case of emergencies, the dam lacks a formal Emergency Action Plan (EAP) but has moderate risk management measures in place to address potential risks and hazards associated with the structure.

Water resource and climate enthusiasts can appreciate the engineering behind Boreen Lower and its role in providing recreational opportunities while managing water flow along the Wild Rice River. The dam's historical and environmental significance in the Twin Valley area, along with its modest impact on the local drainage area and max discharge capacity, make it a noteworthy site for those interested in sustainable water management practices and infrastructure development in Minnesota.