Jlwannamaker Dam 1, located in Calhoun, South Carolina, is a privately owned structure that serves primarily for recreational purposes. Built in 1930, this earth dam stands at 26 feet tall and spans 360 feet in length, with a storage capacity of 54 acre-feet. Despite its low hazard potential, the dam is currently assessed to be in poor condition as of the last inspection in 2017.

Managed by the South Carolina Department of Health and Environmental Control, Jlwannamaker Dam 1 overlooks the Speigner Branch and is under state jurisdiction, with permitting, inspection, and enforcement processes in place. The dam's uncontrolled spillway and buttress core type contribute to its moderate risk level, calling for potential risk management measures to ensure its safety and stability. With a risk assessment score of 3, it is important for water resource and climate enthusiasts to monitor the condition of this dam for any necessary maintenance or improvements in the future.