Marmota Farm Pond Dam Reservoir Report

Last Updated: December 5, 2025

Marmota Farm Pond Dam, located in Fairfax, Virginia, is a privately owned structure primarily used for recreation purposes.


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Summary

This earth dam, standing at a height of 15.9 feet, holds a maximum storage capacity of 66.17 acre-feet and covers a surface area of 6.19 acres. Situated along Mine Run Branch, this dam is regulated by the Department of Conservation and Recreation in Virginia, ensuring that state permitting, inspection, and enforcement are in place to maintain its safety and functionality.

Despite being classified as having an "Undetermined" hazard potential and a "Not Rated" condition assessment, Marmota Farm Pond Dam has not undergone recent evaluation or modification. Its Emergency Action Plan status and risk management measures remain unspecified, leaving room for improvement in terms of preparedness and response protocols. With a close proximity to Jennifer Wexton's (D) congressional district, stakeholders and water resource enthusiasts may want to advocate for enhanced monitoring and maintenance practices to ensure the longevity and safety of this recreational structure.

As a focal point for outdoor activities in Fairfax County, Marmota Farm Pond Dam serves as a valuable resource for locals and visitors alike. With its picturesque setting and potential for water-based recreation, it is essential to prioritize the continued oversight and maintenance of this dam to safeguard both the environment and the community. Efforts to enhance risk assessment, emergency preparedness, and overall condition monitoring can help ensure that Marmota Farm Pond Dam remains a cherished and safe destination for generations to come.

Dam Length

470

Dam Height

15.9

River Or Stream

Mine Run Branch

Primary Dam Type

Earth

Surface Area

6.19

Hydraulic Height

15.9

Nid Storage

66.17

Structural Height

15.9

Hazard Potential

Undetermined

Nid Height

16
       
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.