Mountain Run Dam #11 Reservoir Report

Last Updated: December 5, 2025

Mountain Run Dam #11, also known as Mountain Run Lake, is a local government-owned structure located in Culpeper, Virginia.


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Summary

This earth dam stands at a height of 44 feet and serves a primary purpose of flood risk reduction, while also contributing to water supply management. With a storage capacity of 2880 acre-feet and a normal storage of 611 acre-feet, the dam covers a surface area of 75 acres and drains a 5.9 square mile watershed area.

The dam, managed by the Department of Conservation and Recreation in Virginia, has a high hazard potential but is currently in satisfactory condition as per a 2019 assessment. It undergoes inspections annually to ensure its structural integrity and adherence to regulatory standards. Although there are no associated structures with the dam, its presence along Mountain Run contributes to the overall water management efforts in the region, protecting against flooding and ensuring a stable water supply for the community.

Located within the jurisdiction of the Baltimore District of the US Army Corps of Engineers, Mountain Run Dam #11 plays a crucial role in reducing flood risks and maintaining water resources in Culpeper, Virginia. With its strategic positioning along the Mountain Run stream, the dam serves as a vital infrastructure for the region, demonstrating the importance of effective dam management in mitigating climate-related challenges and ensuring water security for local communities.

Dam Length

722

Dam Height

44

River Or Stream

Mountain Run

Primary Dam Type

Earth

Surface Area

75

Hydraulic Height

44

Drainage Area

5.9

Nid Storage

2880

Structural Height

44

Hazard Potential

High

Nid Height

44
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.