SNOFLO
 


HANNA

RESERVOIR LEVELS
Spearfish Creek
May 12, 2025


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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
       

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