Pine Mountain Lake, located in Cass County, Minnesota, is a state-regulated reservoir on the Pine River. Built in 1936 by the Works Progress Administration (WPA-C), this gravity dam stands at a height of 6 feet and has a maximum storage capacity of 126,737 acre-feet. The dam serves various purposes, including flood control, recreation, and water supply for the surrounding area.

With a surface area of 1,612 acres and a drainage area of 44.1 square miles, Pine Mountain Lake provides a picturesque setting for outdoor enthusiasts to enjoy activities such as boating, fishing, and wildlife observation. The dam is under the jurisdiction of the Minnesota Department of Natural Resources, which oversees its permitting, inspection, and enforcement to ensure its safe operation. Despite its low hazard potential, the dam is regularly assessed and has been deemed to be in satisfactory condition as of the last inspection in 2015.

Pine Mountain Lake's historical significance, combined with its recreational opportunities and vital role in water resource management, make it a valuable asset in Minnesota's landscape. Climate and water resource enthusiasts can appreciate the intricate design and functionality of this gravity dam, which continues to play a crucial role in maintaining the ecological balance and water supply in the region.