Omisol Dam Reservoir Report

Last Updated: December 5, 2025

Omisol Dam, located in Prince William, Virginia, is a privately-owned structure designed for recreation and managed by the Department of Conservation and Recreation.


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Summary

Standing at a height of 21.1 feet with a storage capacity of 156.4 acre-feet, this earth dam regulates Hooes Run, providing essential water management for the area. The dam's surface area of 5.21 acres offers a serene backdrop for outdoor activities, making it a popular spot for water resource and climate enthusiasts.

Despite its high hazard potential, the dam's condition assessment as of August 2012 was rated as fair, indicating a need for ongoing maintenance and monitoring. With a last inspection date in 2012, the dam's emergency action plan is crucial for ensuring public safety in case of a potential breach or flood event. While the risk assessment and management measures for Omisol Dam are currently unspecified, its presence as a recreational site highlights the importance of balancing water resource utilization with environmental conservation efforts.

Given its scenic location and vital role in water regulation, Omisol Dam serves as a valuable asset in Prince William, Virginia. As climate change continues to impact water resources, the dam's role in managing Hooes Run and providing recreational opportunities underscores the need for sustainable water management practices. By maintaining a fair condition assessment and implementing effective risk management strategies, Omisol Dam stands as a testament to the intersection of recreation, water conservation, and climate resilience in the region.

Dam Length

250

Dam Height

21.1

River Or Stream

Hooes Run

Primary Dam Type

Earth

Surface Area

5.21

Hydraulic Height

21.1

Drainage Area

5.21

Nid Storage

156.4

Structural Height

21.1

Hazard Potential

High

Nid Height

21
       
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.