Boulder Lake, located in Cloquet, Minnesota, is a picturesque reservoir with a rich history dating back to its completion in 1919. Managed by the Federal Energy Regulatory Commission, this hydroelectric dam serves multiple purposes, including providing recreational opportunities for visitors. The dam, consisting of concrete, earth, and multi-arch structures, stands at a height of 20 feet and spans 1470 feet in length.

With a storage capacity of 30,300 acre-feet and a normal storage of 29,440 acre-feet, Boulder Lake covers a surface area of 4100 acres and has a drainage area of 63 square miles. The controlled spillway, with a width of 8 feet, ensures the safe management of water levels, while the low hazard potential and regular inspections contribute to its overall safety. Despite facing a very high risk assessment, the dam's emergency action plan is up to date, reflecting its commitment to preparedness and risk management.

Boulder Lake's association with Otter Creek adds to its charm, attracting water resource and climate enthusiasts seeking to explore the surrounding St. Louis County area. With its blend of historical significance, recreational offerings, and environmental stewardship, Boulder Lake stands as a testament to the enduring relationship between nature and infrastructure in the heart of Minnesota.