Helsell Dam, located in San Juan, Washington, is a privately owned earth dam completed in 1999 primarily for recreational purposes. The dam stands at a hydraulic height of 16 feet and has a structural height of 16 feet, with a length of 150 feet. It has a maximum storage capacity of 82 acre-feet and a normal storage capacity of 55 acre-feet, serving as a source of water resource for the area.

The dam is situated on an unnamed creek and is under the regulatory jurisdiction of the Washington Department of Ecology. Despite being classified as having a low hazard potential, the dam's condition assessment is currently not rated. The last inspection of the dam was conducted in August 2009, with no further updates on its emergency action plan or risk management measures.

With its picturesque location and potential for recreational activities, Helsell Dam serves as a vital water resource in the region. However, continuous monitoring and assessment of the dam's condition and risk management measures are essential to ensure the safety and sustainability of its operations in the face of climate change and evolving water resource management practices.