Hells Canyon, located in Idaho along the Snake River, is a privately owned hydroelectric dam that was completed in 1967. This gravity dam stands at a height of 323 feet, with a structural height of 330 feet and a length of 910 feet. With a normal storage capacity of 170,000 acre-feet and a maximum storage of 188,000 acre-feet, the dam covers a surface area of 2,430 acres and serves multiple purposes including hydroelectric power generation, navigation, and recreation.

Managed by the Federal Energy Regulatory Commission, Hells Canyon Dam has a controlled spillway with a width of 159 feet and five Tainter (radial) gates for outlet control. The dam's hazard potential is classified as high, with a very high risk assessment rating. While the condition assessment is not available, the dam's emergency action plan was last revised in April 2021. With its impressive engineering design and significant impact on the surrounding environment and water resources, Hells Canyon Dam remains a notable structure for water resource and climate enthusiasts to study and explore in the picturesque setting of Adams County, Idaho.