Marco Millpond Dam, located in Darlington, South Carolina, is a privately owned earth dam built in 1900 to impound water from the Sparrow Swamp. With a height of 7 feet and a length of 1300 feet, the dam provides a storage capacity of 742 acre-feet, primarily for recreational purposes. Despite its low hazard potential, the dam is in poor condition as of the last assessment in November 2017.

Managed by the South Carolina Department of Health and Environmental Control (DHEC), the dam is subject to state regulations, permitting, inspection, and enforcement. The dam's primary purpose is listed as "Other," which likely includes wildlife habitat enhancement and flood control. The surrounding Marco Millpond area covers 140 acres and offers a serene environment for water resource and climate enthusiasts to enjoy outdoor activities.

With its historical significance dating back over a century, Marco Millpond Dam serves as a reminder of the vital role dams play in water management and recreation. While the dam's condition may require attention to ensure its long-term safety and functionality, its presence continues to contribute to the local ecosystem and provide a unique experience for visitors seeking to connect with nature in South Carolina's beautiful countryside.