Ripple Lake, located in Aitkin, Minnesota, is a picturesque recreational spot that was completed in 1938 by the Works Progress Administration (WPA). The dam at Ripple Lake is a gravity structure with a height of 6 feet and a hydraulic height of 1.9 feet. The primary purpose of the dam is for recreation, providing a surface area of 600 acres and a normal storage capacity of 1600 acre-feet.

Despite its age, Ripple Lake's dam is in poor condition and has a very high risk assessment rating of 1. With a low hazard potential, the dam poses a potential risk to the surrounding area in the event of a failure. The dam is under state jurisdiction and is regulated by the Minnesota Department of Natural Resources (MNDNR EWR), with state permitting, inspection, and enforcement in place to ensure its safety. Despite its condition, Ripple Lake remains a popular destination for water resource and climate enthusiasts looking to enjoy the beauty of the Ripple River and surrounding area.