Fountain Lake, located in Portage, Wisconsin, is a state-regulated reservoir on Emmons Creek with a primary purpose of recreation. This gravity dam, completed in 1938, has a structural height of 8 feet and a length of 50 feet, providing a storage capacity of 120 acre-feet. With a surface area of 16 acres and a drainage area of 2 square miles, Fountain Lake is a popular destination for water resource and climate enthusiasts to enjoy outdoor activities.

Despite being classified as a low hazard potential structure with a moderate risk assessment, Fountain Lake has not been rated for its condition assessment as of the last inspection in 2011. The emergency action plan (EAP) for the dam was last revised in 2015, although details on its compliance with guidelines and preparedness for potential emergencies are not provided. The reservoir's spillway is uncontrolled, with a width of 5 feet, and the dam has not been modified in recent years, indicating a stable and maintained structure for recreational use.

With its scenic location and recreational opportunities, Fountain Lake offers a peaceful retreat for visitors to enjoy water activities and explore the natural beauty of the surrounding area. As a state-regulated dam with a history dating back to the late 1930s, it serves as a valuable resource for the community and a picturesque setting for water resource and climate enthusiasts to appreciate and protect.