Green Lake, located in Kandiyohi, Minnesota, is a gravity dam constructed in 1938 by the Works Progress Administration. The dam stands at a height of 6.5 feet and has a structural height of 9 feet, with a length of 62 feet. It serves as a water resource regulated by the Minnesota Department of Natural Resources, with a storage capacity of 11,700 acre-feet and a surface area of 5,560 acres. The dam's primary purpose is listed as "Other", and it is responsible for managing the water flow of the Crow River Middle Fork.

Despite its low hazard potential, Green Lake has not been rated for its condition assessment as of the last inspection in June 2016. The dam is under the jurisdiction of the state and is subject to permitting, inspection, and enforcement by the MNDNR EWR. With a drainage area of 149 square miles and a maximum discharge of 1,115 cubic feet per second, Green Lake plays a crucial role in water management in the region. Enthusiasts of water resources and climate will find Green Lake an interesting and important structure to study and monitor for its impact on the local ecosystem and surrounding communities.