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Hanna, located in Cheyenne Crossing, South Dakota, is a federal recreation dam on Spearfish Creek owned and operated by the USDA Forest Service. With a dam height of 12 feet and a hydraulic height of 10 feet, Hanna serves as a fish and wildlife pond, offering recreational opportunities for water and climate enthusiasts. The dam has a storage capacity of 27 acre-feet and a maximum discharge of 150 cubic feet per second, making it a vital resource for the surrounding area.
Despite its significant hazard potential, Hanna has not been rated for its condition assessment. The dam features an uncontrolled spillway with a width of 10 feet and an outlet gate system. The last inspection of Hanna was conducted in September 2019, with a moderate risk assessment rating of 3. As a key component in the local water resource infrastructure, Hanna plays a crucial role in managing water flow and providing a recreational space for the community.
For water resource and climate enthusiasts, Hanna represents a noteworthy site for studying dam structures and their impact on the environment. With its federal ownership and primary purpose of recreation, Hanna serves as a valuable asset in the management of Spearfish Creek's water resources. As efforts continue to assess and manage the dam's risk potential, Hanna remains a focal point for conservation and enjoyment in Lawrence County, South Dakota.
Dam_Height | 12 |
River_Or_Stream | SPEARFISH CREEK |
Dam_Length | 300 |
Primary_Dam_Type | Earth |
Hydraulic_Height | 10 |
Nid_Storage | 27 |
Structural_Height | 12 |
Outlet_Gates | Uncontrolled |
Hazard_Potential | Significant |
Nid_Height | 12 |