Keyhole is a Federal-owned dam located in Hulett, Wyoming, along the Belle Fourche River. Built in 1951 by designer Paul H. Berg, this earth dam stands at a height of 168 feet and serves primarily for flood risk reduction and irrigation purposes. Managed by the Bureau of Reclamation, Keyhole has a storage capacity of 629,025 acre-feet and covers a surface area of 9,411 acres.

With a high hazard potential, Keyhole is regulated and inspected by the Bureau of Reclamation to ensure its structural integrity and operational efficiency. The dam's spillway width is 19 feet, and it has a maximum discharge capacity of 10,850 cubic feet per second. Although the condition assessment is currently not available, the dam's Emergency Action Plan has been prepared and last revised in March 2017, indicating readiness for potential emergencies.

As a vital water resource infrastructure in Crook County, Wyoming, climate and water resource enthusiasts can appreciate Keyhole's significant role in managing flood risks and supporting irrigation activities in the region. Its strategic location and design reflect a commitment to enhancing water security and resilience in the face of changing environmental conditions.