Ew Martin Lake Dam, also known as C W Stewart Dam, is a private dam located in Spartanburg, South Carolina. Constructed in 1973 by the USDA NRCS, this earth dam serves the primary purpose of debris control on the TR-Lake William C Bowen river. With a height of 29 feet and a length of 800 feet, the dam has a storage capacity of 35 acre-feet and a surface area of 3 acres.

Managed by the SC DHEC and regulated by the state, Ew Martin Lake Dam has a low hazard potential and is currently in fair condition as of the last assessment in May 2017. Despite its uncontrolled spillway and outlet gates, the dam remains a crucial structure for debris control and recreation in the area. With a moderate risk assessment score, the dam poses some level of risk, prompting the need for regular inspections and maintenance to ensure public safety and environmental protection.

As a key feature in the region's water resource management, Ew Martin Lake Dam plays a vital role in flood control and recreational activities. With its historic significance and ongoing regulatory oversight, the dam serves as a reminder of the importance of maintaining infrastructure for both practical and leisure purposes in a sustainable manner.