Marathon Dam is a water management facility located in Marathon, Ontario, Canada. It plays a crucial role in regulating water flow in the area, ensuring a stable supply for local communities and ecosystems. The dam is part of the Nipigon River system, which is vital for both environmental health and recreational activities. Constructed in the mid-20th century, Marathon Dam also supports hydroelectric power generation, contributing to the region's energy needs. The facility is monitored for safety and environmental impact, helping to maintain the balance between human use and natural preservation in the surrounding Lake Superior watershed.