Lake Mooney Dam Reservoir Report

Last Updated: December 6, 2025

Lake Mooney Dam, also known as Rocky Pen Run Reservoir Dam, is a vital water resource structure located in Stafford, Virginia.


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Summary

Owned by the local government and regulated by the Department of Conservation and Recreation, this earth dam stands at a height of 130 feet and has a storage capacity of 21,100 acre-feet. The primary purpose of the dam is to supply water, with a normal storage capacity of 16,200 acre-feet and a surface area of 518 acres.

With a high hazard potential but satisfactory condition assessment as of September 2020, Lake Mooney Dam plays a crucial role in water supply management in the region. The dam, completed in an unspecified year, spans 1350 feet and sits along the Rocky Pen Run, serving as a key infrastructure for water storage and management. Despite lacking specific information on construction and design details, this dam remains a significant asset for the community's water needs.

As water resource and climate enthusiasts, Lake Mooney Dam presents an intriguing case study for understanding the intersection of infrastructure, water management, and environmental stewardship. With its high hazard potential and regular inspections, the dam highlights the importance of maintaining critical water structures to ensure both safety and sustainability in the face of changing climate conditions. Monitoring and managing this essential resource will continue to be a priority for local authorities and conservation agencies to safeguard water availability for the community.

Dam Length

1350

Dam Height

130

River Or Stream

Rocky Pen Run

Primary Dam Type

Earth

Surface Area

518

Hydraulic Height

130

Drainage Area

5.2

Nid Storage

21100

Structural Height

130

Hazard Potential

High

Nid Height

130
       
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.