Hanna is an earth dam located in Lawrence County, South Dakota. It carries a Significant hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 300 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Hanna
The primary purpose of Hanna is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Usda Fs (federal). It impounds the Spearfish Creek near Cheyenne Crossing.
The dam stands 12 feet tall and stretches 300 feet across, and has a maximum storage capacity of 27 acre-feet.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 09/24/2019.
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Location
| State | South Dakota |
| County | Lawrence |
| Nearest City | Cheyenne Crossing |
| River/Stream | Spearfish Creek |
| Coordinates | 44.25809, -103.84134 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 300 ft |
Storage & Hydraulics
| NID Storage | 27 acre-ft |
| Max Storage | 27 acre-ft |
| Normal Storage | 21 acre-ft |
| Max Discharge | 150 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Usda Fs |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 09/24/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02619 |
| Federal ID | SD02619 |
| More Info | State Dam Safety Program |