Henry (Scotland)

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Lake Henry, also known as Henry (Scotland), is a state-regulated water resource located in Bon Homme, South Dakota. Built in 1938, this earth dam stands at a height of 45 feet and has a storage capacity of 3,000 acre-feet. It is situated on Dawson Creek and serves a drainage area of 40 square miles, with a maximum discharge capacity of 11,000 cubic feet per second.

Managed by the South Dakota Department of Agriculture and Natural Resources, Lake Henry's spillway type is uncontrolled, with a width of 160 feet. The dam's hazard potential is deemed significant, with a moderate risk assessment rating of 3. Despite its age, the condition of the dam is currently not rated, and the last inspection took place in November 2016. With its vertical lift outlet gates and state permitting and inspection protocols in place, Lake Henry remains a critical water resource in the region for both water supply and climate resilience efforts.

Enthusiasts of water resources and climate management can appreciate the historical significance and engineering marvel of Lake Henry. As a key infrastructure in the St. Paul District managed by the state, it serves as a vital component of the local water supply system. With its strategic location and design features, including an earth dam and stone core, Lake Henry plays a crucial role in flood control and water management for the surrounding area. Its regulated status and regular inspection ensure the safety and integrity of this essential water resource for the community.