Masonry Dam, located in Cedar Falls, Washington, is a historic arch dam completed in 1914 for the primary purpose of water supply. It stands at an impressive hydraulic height of 230 feet and has a structural height of 215 feet, with a length of 980 feet. The dam has a normal storage capacity of 90,660 acre-feet and a maximum storage capacity of 175,000 acre-feet, serving the Cedar River watershed with a surface area of 280 acres and a drainage area of 81.4 square miles.

Managed by the Washington Department of Ecology, Masonry Dam is state-regulated and regularly inspected to ensure its safety and compliance with regulatory standards. With a hazard potential rated as high, the dam's condition assessment in 2020 was deemed satisfactory. While the dam has not undergone significant modifications in recent years, emergency action plans are in place to address any potential risks, although the details of these plans are yet to be updated.

Despite its age, Masonry Dam continues to play a crucial role in the water supply and hydroelectric needs of the region. With its rich history and impressive engineering, the dam stands as a testament to the importance of water resource management in the face of changing climate conditions. Its location in the picturesque King County, Washington, adds to its appeal for water resource and climate enthusiasts seeking to learn about the intersection of infrastructure, sustainability, and environmental stewardship.