D.O.E. Savannah River Pond B, also known as 685-13g, is a Federal-owned structure located in Martin, Barnwell, South Carolina. This dam was completed in 1960 and serves as an important water resource in the area, with a primary purpose of "Other". The dam is an Earth-type structure, with a height of 50 feet and a length of 1750 feet. It has a storage capacity of 4413 acre-feet and a low hazard potential.

The dam is managed by the Department of Energy, which is also responsible for funding, designing, constructing, regulating, inspecting, and operating the structure. While the dam has not been modified in recent years, it is subject to regular inspections every 2 years. The risk assessment for D.O.E. Savannah River Pond B is rated as moderate, with a moderate risk level of 3.

Overall, D.O.E. Savannah River Pond B plays a vital role in water resource management in the area, providing storage capacity and regulating water flow in the Lower Three Runs-TR river/stream. With its low hazard potential and moderate risk assessment, this dam serves as a key infrastructure for climate and water resource enthusiasts to monitor and study in the region.