Beaulieu Lake, located in Mahnomen, Minnesota, is a picturesque reservoir with a rich history dating back to its completion in 1922. This gravity dam, standing at a height of 10 feet and stretching 300 feet in length, serves as a vital water resource for the surrounding area. With a normal storage capacity of 1128 acre-feet and a drainage area of 43.6 square miles, Beaulieu Lake plays a crucial role in managing water flow and storage in the region.

Despite its age, Beaulieu Lake has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The dam's primary purpose is categorized as "Other," with a design by DU and ownership by the Federal government. The reservoir's location near Marsh Creek makes it a valuable asset for water management and conservation efforts in the area. With its serene surroundings and important role in water resource management, Beaulieu Lake stands as a testament to the intersection of engineering, nature, and sustainability in the beautiful state of Minnesota.