Willis River Dam #6 Reservoir Report
Last Updated: December 6, 2025
Located in Cumberland, Virginia, Willis River Dam #6, also known as Johns Dam, serves as a vital flood risk reduction structure along the Little Willis River.
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Summary
Owned and regulated by the Department of Conservation and Recreation, this earth dam stands at a height of 47.1 feet and stretches 496 feet in length, providing a storage capacity of 4922 acre-feet. Despite its fair condition assessment and high hazard potential, the dam has undergone regular inspections, with the last one conducted in October 2019.
With a normal storage capacity of 190 acre-feet and a drainage area of 16.1 square miles, Willis River Dam #6 plays a crucial role in managing water resources and mitigating flood risks in the region. Its strategic location and design highlight its significance in safeguarding nearby communities and infrastructure from potential water-related disasters. The dam's construction and operation adhere to state regulations, ensuring its effectiveness in flood control and water management initiatives.
As a key structure in the Norfolk District, Willis River Dam #6 not only supports flood risk reduction efforts but also contributes to the overall water resource management strategy in Virginia. With a focus on safety and regulatory compliance, the dam continues to play a pivotal role in protecting the environment and enhancing the resilience of the local watershed. Climate enthusiasts and water resource professionals alike recognize the importance of this dam in sustaining a balanced ecosystem and safeguarding the community against water-related hazards.
Dam Length |
496 |
Dam Height |
47.1 |
River Or Stream |
LITTLE WILLIS RIVER |
Primary Dam Type |
Earth |
Surface Area |
38 |
Hydraulic Height |
47.1 |
Drainage Area |
16.1 |
Nid Storage |
4922 |
Structural Height |
47.1 |
Hazard Potential |
High |
Nid Height |
47 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Appomattox River At Farmville
|
132cfs |
Buffalo Creek Near Hampden Sydney
|
26cfs |
Holiday Creek Near Andersonville
|
2cfs |
Slate River Near Arvonia
|
68cfs |
James River At Bent Creek
|
1290cfs |
James River At Cartersville
|
1950cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Willis River Dam #6
Turkey Ridge Natural Area
Headwaters Natural Area
Chestnut Ridge Natural Area
Bear Creek Lake State Park
Holliday Lake State Park