Margaret Lake, also known as Marget Lake Dam, is a captivating water resource located in St. Francis, Minnesota. This state-regulated dam was completed in 1966 by the USDA NRCS and serves various purposes, including providing 2040 acre-feet of storage capacity and controlling the flow of the Rum River-TR. With a low hazard potential and satisfactory condition assessment, Margaret Lake is a key infrastructure managed by the Minnesota Department of Natural Resources.

The Earth-type dam stands at 18 feet high and 20 feet long, with a surface area of 115 acres and a drainage area of 1 square mile. Despite its lack of a spillway, the dam has proven to be effective in regulating water flow and managing the risk of flooding in the region. The dam's structure is buttressed and rests on an unlisted/unknown foundation, ensuring its stability and functionality for years to come.

With the support of state agencies and the USDA NRCS, Margaret Lake continues to play a crucial role in water management and climate resilience efforts in Isanti County, Minnesota. As a vital piece of infrastructure in the region, the dam's impact on water resources, wildlife habitats, and community safety underscores the importance of sustainable dam management practices in the face of changing environmental conditions.