Clarks Mill Dam Reservoir Report

Last Updated: December 5, 2025

Clarks Mill Dam, located in Northumberland, Virginia, is a state-regulated structure on the TR-COAN RIVER, overseen by the Department of Conservation and Recreation.


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Summary

The dam serves primarily for recreational purposes, offering a serene environment for water enthusiasts to enjoy. Standing at a height of 20 feet with a length of 450 feet, the Earth-type dam has a storage capacity of 138 acre-feet, providing ample space for outdoor activities such as fishing and boating.

Although the condition assessment of Clarks Mill Dam is currently labeled as "Not Rated," its hazard potential is classified as "Undetermined." With an inspection frequency of once per year, the dam's emergency action plan status and risk assessment details are yet to be determined. Despite these uncertainties, the dam remains a popular spot for locals and visitors alike to appreciate the beauty of the surrounding natural landscape while engaging in water-based recreational activities.

As a key structure in the Norfolk District, Clarks Mill Dam plays a vital role in water resource management in the region. With its picturesque location and potential for outdoor recreation, this dam serves as a valuable asset for water and climate enthusiasts seeking to explore and appreciate the natural beauty of the Northumberland area.

Dam Length

450

Dam Height

20

River Or Stream

TR-COAN RIVER

Hydraulic Height

20

Nid Storage

138

Structural Height

20

Hazard Potential

Undetermined

Nid Height

20
       
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.