Mannheim Dam Reservoir Report
Nearby: Jones Dam #2 Ashland Mill Dam
Last Updated: December 23, 2025
Mannheim Dam, located in Hanover, Virginia, is a recreational dam that spans 300 feet in length and stands at a height of 21 feet.
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Summary
Situated on a tributary of the South Anna River, this earth dam provides a storage capacity of 70 acre-feet for recreational purposes. While the hazard potential of the dam is currently undetermined and its condition has not been rated, it is regulated by the Department of Conservation and Recreation in Virginia.
Owned by an unspecified entity, Mannheim Dam is not associated with any federal agencies and has not received funding or design assistance from such entities. Despite its state-regulated status and the presence of inspection, enforcement, and permitting processes in place, the dam lacks a designated primary dam type and is rated as "Not Rated" in terms of its condition assessment. The dam's Emergency Action Plan (EAP) status, risk assessment, and risk management measures are also not documented.
With its picturesque location and recreational focus, Mannheim Dam serves as a popular destination for water resource and climate enthusiasts seeking opportunities for outdoor activities and relaxation. While the dam's specific construction year, surface area, and drainage area remain undisclosed, its presence adds to the natural beauty and appeal of the Hanover, Virginia area. Despite some uncertainties regarding its hazard potential and condition assessment, Mannheim Dam continues to provide a tranquil setting for visitors to enjoy the surrounding scenery and engage in recreational pursuits.
Dam Length |
300 |
Dam Height |
21 |
River Or Stream |
trib. South Anna River |
Hydraulic Height |
21 |
Nid Storage |
70 |
Structural Height |
21 |
Hazard Potential |
Undetermined |
Nid Height |
21 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Mannheim Dam