Dam No 4, also known as Sugar Valley Dam No 4, is a private-owned structure located in Linn, Kansas, along the Mine Creek-TR river system. This earth-type dam stands at a height of 32.1 feet and serves primarily for recreational purposes, offering a serene environment for water resource and climate enthusiasts to enjoy. With a normal storage capacity of 32 acre-feet and a drainage area of 0.26 square miles, Dam No 4 provides a vital source of water for the surrounding area.

Despite its fair condition assessment and high hazard potential, Dam No 4 has not been modified in recent years and lacks certain safety features such as outlet gates. The dam's spillway, with a width of 46 feet, is uncontrolled, posing some risks during periods of high discharge. The structure is under the jurisdiction of the Kansas Department of Agriculture and undergoes regular inspections to ensure its safety and compliance with regulations. For those interested in water resources and climate management, Dam No 4 offers a fascinating opportunity to explore the intersection of human infrastructure and natural ecosystems in the heart of Kansas.