Rasmussen Lake Dam, also known as Elmwood Farms Lake Dam, is a private dam located in Millburn-Offstream, Illinois. Completed in 1965, this earth dam stands at a height of 19 feet and stretches 600 feet in length, creating a storage capacity of 370 acre-feet for recreational purposes. Situated on North Mill Creek, the dam is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its integrity and safety.

With a low hazard potential and a moderate risk assessment rating, Rasmussen Lake Dam poses minimal risk to surrounding areas in the event of a failure. Despite the lack of available condition assessment data, the dam's emergency action plan status and risk management measures remain unspecified. The dam features an uncontrolled spillway with a width of 27 feet, providing a controlled release of water during high flow events to prevent overtopping and potential flooding downstream.

Water resource and climate enthusiasts interested in Rasmussen Lake Dam will find it to be a key component in the local recreational landscape, offering opportunities for fishing, boating, and other outdoor activities. While the dam's condition assessment and emergency preparedness status may need further clarification, its low hazard potential and regulated status indicate a commitment to maintaining its safety and function for both recreational and environmental purposes. The dam's location in Lake County, Illinois, within the Detroit District of the US Army Corps of Engineers, underscores its importance in managing water resources in the region.