Jays Pond Dam, located in San Juan, Washington, serves as a crucial water supply source for the region. Completed in 1973, this earth dam stands at a hydraulic height of 9 feet and a structural height of 8 feet, with a maximum storage capacity of 19 acre-feet. The dam's primary purpose is water supply, although it also supports recreational activities in the area.

Managed by a private owner, Jays Pond Dam falls under the regulatory oversight of the Washington Department of Ecology. With a high hazard potential but a satisfactory condition assessment as of June 2018, the dam undergoes inspections every five years to ensure its safety and functionality. The emergency action plan for the dam was last revised in May 2019, indicating a commitment to preparedness and risk management.

Despite its modest surface area of 3.1 acres and drainage area of 0.03 square miles, Jays Pond Dam plays a significant role in water resource management in the region. Its presence on Tr-Deer Harbor ensures a stable water supply for the community while also offering opportunities for recreational enjoyment. As climate change continues to impact water resources, the maintenance and regulation of dams like Jays Pond Dam are essential for sustainable water management in the face of evolving environmental challenges.