Walden Pond Dam #3, located in Marvin, North Carolina, is a privately-owned earth dam that serves primarily for recreational purposes. Completed in 1996, the dam stands at a structural height of 19.3 feet and has a hydraulic height of 12 feet, providing a reservoir with a normal storage capacity of 50 acre-feet. The dam's location on the Tarkhill Branch-Os river stream adds to its scenic beauty and recreational value, attracting water resource and climate enthusiasts alike.

Despite its fair condition assessment as of December 2019, Walden Pond Dam #3 has a high hazard potential, emphasizing the need for regular inspections and maintenance. The dam is regulated by the North Carolina Department of Environmental Quality's Dam Safety Program, ensuring that state permitting, inspection, and enforcement measures are in place to mitigate any potential risks. With its close proximity to the community and surrounding natural areas, the dam plays a vital role in providing recreational opportunities while also being essential for flood control and water resource management in the region.

As a focal point for outdoor activities and environmental appreciation, Walden Pond Dam #3 holds significant importance for the local community and visitors. Its role in water management and conservation efforts in Union County contributes to the overall sustainability of the region, making it a valuable asset for water resource and climate enthusiasts to explore and appreciate. With proper oversight and maintenance, the dam continues to serve its intended purposes while enhancing the natural beauty of its surroundings.