Conconully is a historic earth dam located in Okanogan, Washington, built in 1909 by the Bureau of Reclamation for irrigation purposes. Standing at 72 feet tall with a hydraulic height of 63 feet, it harnesses the waters of Salmon Creek, providing a maximum storage capacity of 16,570 acre-feet and servicing a drainage area of 5 square miles. The dam covers a surface area of 450 acres and boasts a spillway width of 149 feet for uncontrolled discharge, with a maximum capacity of 11,580 cubic feet per second.

Managed by the Bureau of Reclamation, Conconully's hazard potential is classified as high, with a moderate risk assessment score of 3. The dam has not undergone a recent condition assessment, but emergency action plans have been prepared, last revised in September 2020. While the dam has not been modified in recent years, it remains a critical piece of infrastructure for the surrounding area, providing essential irrigation water to support agricultural activities. With its rich history and significant role in water resource management, Conconully stands as a testament to the importance of infrastructure in sustaining communities and ecosystems in Washington state.