Cedar Run Dam #3 Reservoir Report

Last Updated: December 5, 2025

Cedar Run Dam #3, also known as Airlie Dam, is a crucial structure located in Fauquier, Virginia, along the Cedar Run river.


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Summary

Owned by the local government, this earth dam stands at a height of 55 feet and serves primarily for flood risk reduction and water supply purposes. With a normal storage capacity of 792 acre-feet and a maximum storage of 2513 acre-feet, Cedar Run Dam #3 plays a significant role in managing water resources in the region.

Managed by the Department of Conservation and Recreation in Virginia, this dam has a high hazard potential but is currently rated as satisfactory in its condition assessment. The last inspection in February 2020 deemed the structure to be in good shape. While the dam has not been modified in recent years, regular state inspections and enforcement measures ensure its continued safety and functionality. With a drainage area of 3.53 square miles, Cedar Run Dam #3 serves as a vital component of the region's water management infrastructure.

For water resource and climate enthusiasts, Cedar Run Dam #3 offers a fascinating glimpse into the complex interplay between infrastructure, regulation, and natural resources. As a key flood risk reduction structure in Virginia, this dam underscores the importance of proactive management and monitoring to ensure the safety and sustainability of water resources in the region. With its strategic location and critical role in water supply, Cedar Run Dam #3 represents a valuable asset for both local communities and the broader ecosystem.

Dam Length

2470

Dam Height

55

River Or Stream

Cedar Run

Primary Dam Type

Earth

Surface Area

55

Hydraulic Height

55

Drainage Area

3.53

Nid Storage

2513

Structural Height

55

Hazard Potential

High

Nid Height

55
       
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.
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