Mountain Run Dam #13 Reservoir Report
Last Updated: December 5, 2025
Mountain Run Dam #13, also known as Merrimac Lake, is a local government-owned earth dam located in Culpeper, Virginia.
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Summary
Designed by the Virginia Department of Conservation and Recreation, this dam plays a crucial role in flood risk reduction along the Hungry Run river. With a height of 30.5 feet and a storage capacity of 1140 acre-feet, this dam serves as a vital infrastructure for water resource management in the region.
Situated within the jurisdiction of the Department of Conservation and Recreation, Mountain Run Dam #13 has a high hazard potential but is currently in satisfactory condition as per the latest inspection in April 2021. The dam has a normal storage capacity of 42 acre-feet and covers a surface area of 15 acres, serving as a key component in the drainage area of 3.2 square miles. While no spillway type or width is provided, the dam's primary purpose of flood risk reduction underscores its importance in safeguarding the local community from potential water-related disasters.
As a part of the Baltimore District, this dam has not been modified in recent years and is subject to regular inspections and enforcement by state regulatory agencies. With Abigail Davis Spanberger representing the area in Congress, Mountain Run Dam #13 stands as a testament to effective collaboration between local and state authorities in ensuring the safety and sustainability of water resources and climate resilience in the region.
Dam Length |
940 |
Dam Height |
30.5 |
River Or Stream |
Hungry Run |
Primary Dam Type |
Earth |
Surface Area |
15 |
Hydraulic Height |
30.5 |
Drainage Area |
3.2 |
Nid Storage |
1140 |
Structural Height |
30.5 |
Hazard Potential |
High |
Nid Height |
31 |
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.
Mountain Run Dam #13