F.P. Griffith Water Plant Stormwater Outflow #6 Reservoir Report

Last Updated: December 5, 2025

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Summary

Griffith Water Plant Stormwater Outflow #6, also known as Ck Report #6, is a vital infrastructure owned by the public utility in Fairfax, Virginia. This stormwater outflow structure, located along Little Occoquan Run, plays a crucial role in flood risk reduction in the area. The dam, primarily designed for this purpose, stands at a height of 22 feet and has a storage capacity of 50.3 acre-feet, with a normal storage level of 15.5 acre-feet.

Managed by the Department of Conservation and Recreation in Virginia, this Earth-type dam spans 470 feet in length, covering a surface area of 2.4 acres. Despite an undetermined hazard potential and a lack of condition assessment rating, this structure is regularly inspected, with a designated inspection frequency of 1. While the exact completion date and modification history remain unspecified, the dam serves as a critical component in the local water resource and climate management strategy. The involvement of state regulatory agencies ensures that the dam meets necessary safety and operational standards.

With an emphasis on flood risk reduction, F.P. Griffith Water Plant Stormwater Outflow #6 stands as a testament to proactive infrastructure planning and management in the face of changing climate patterns. The structure, located within the jurisdiction of the Norfolk District and under the oversight of Representative Gerald E. Connolly, exemplifies the collaborative efforts between state and federal agencies in safeguarding communities against potential water-related hazards. As climate enthusiasts and water resource advocates, understanding and monitoring the condition and functionality of such essential structures is crucial for sustainable water management practices in the region.

Dam Length

470

Dam Height

22

River Or Stream

Little Occoquan Run

Primary Dam Type

Earth

Surface Area

2.4

Hydraulic Height

22

Nid Storage

50.3

Structural Height

22

Hazard Potential

Undetermined

Nid Height

22
       
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.