Lake Anna Dam And Reservoir - Dike I Reservoir Report
Last Updated: December 8, 2025
Lake Anna Dam and Reservoir, specifically Dike I, is a vital water supply structure located in Louisa, Virginia.
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Summary
Built in 1972 by Stone & Webster Engineering Corp., this earth dam stands at a height of 23 feet and spans 4200 feet, providing storage of up to 487,000 acre-feet of water. The reservoir covers an impressive 13,000 acres and serves as a crucial source of water for the surrounding area.
Managed by a public utility, the dam is regulated by the Federal Energy Regulatory Commission and is inspected regularly to ensure its safety and functionality. While it has a low hazard potential, the risk assessment indicates a high risk level of 2, prompting the need for effective risk management measures. Despite its age, the dam's condition assessment is not available, highlighting the importance of continued monitoring and maintenance to prevent any potential issues.
With its primary purpose being water supply, Lake Anna Dam and Reservoir - Dike I plays a crucial role in meeting the water needs of the region. Its location on the North Anna River, under the jurisdiction of the Baltimore District, makes it a key piece of infrastructure in ensuring water security for the community. As climate change impacts water resources, structures like Dike I become even more critical in managing and conserving water for future generations.
Year Completed |
1972 |
Dam Length |
4200 |
Dam Height |
23 |
River Or Stream |
North Anna |
Primary Dam Type |
Earth |
Surface Area |
13000 |
Hydraulic Height |
23 |
Nid Storage |
487000 |
Structural Height |
23 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
23 |
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.
Lake Anna Dam And Reservoir - Dike I