South Anna Dam #23
South Anna Dam #23 is an earth dam located in Louisa County, Virginia. It carries a Significant hazard potential classification and has a fair condition assessment.
About South Anna Dam #23
The primary purpose of South Anna Dam #23 is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Thomas Jefferson Soil And Water Conservation District (local government). It impounds the Desper Creek.
The dam stands 32 feet tall and stretches 670 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 417 acre-feet, and collects water from a drainage area of 1 square miles.
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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 04/28/2020.
At 32 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Virginia |
| County | Louisa |
| River/Stream | Desper Creek |
| Coordinates | 37.97260, -77.95050 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 670 ft |
Storage & Hydraulics
| NID Storage | 417 acre-ft |
| Max Storage | 417 acre-ft |
| Normal Storage | 53 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 8,303 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Thomas Jefferson Soil and Water Conservation District |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 04/28/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | VA109035 |
| Federal ID | VA109035 |
| More Info | State Dam Safety Program |