Flat Lake, located in Becker County, Minnesota, is a gravity-type dam completed in 1941 with a primary purpose of "Other." The dam stands at a height of 6 feet and has a structural height of 8 feet, with a length of 330 feet. It has a normal storage capacity of 5020 acre-feet and a maximum storage of 12100 acre-feet, serving a drainage area of 33.5 square miles. The reservoir covers a surface area of 1754 acres and is situated on the Egg River.

With a low hazard potential and a condition assessment of "Not Rated," Flat Lake dam has not been inspected recently and has an inspection frequency of 8 years. While the dam does not have an Emergency Action Plan (EAP) prepared, it meets guidelines for risk management measures. Despite being federally owned, there are no associated federal agencies for funding, design, construction, regulation, inspections, or operations. This picturesque reservoir is a vital water resource in the region, serving various purposes while maintaining a low risk profile for the surrounding community and environment.