Lily Lake Dam, located in Larimer County, Colorado, is a federal-owned structure managed by the National Park Service for the primary purpose of creating a Fish and Wildlife Pond. Built in 1913, this Earth-type dam stands at a height of 15 feet and spans 240 feet in length, with a storage capacity of 91 acre-feet. It is situated on Fish Creek and is not regulated by the state, with inspections carried out by the Bureau of Reclamation.

With a Hazard Potential rated as high and a Risk Assessment of moderate, Lily Lake Dam poses some safety concerns that are being monitored. Although the condition assessment is listed as not available, emergency action plans have been prepared and updated periodically to ensure preparedness in case of any unforeseen events. The dam also serves as a recreational area, highlighting the balance between conservation efforts and public enjoyment of the natural surroundings.