Cosner Dam Reservoir Report
Nearby: Linton Dam Melanie Morgan Dam
Last Updated: January 12, 2026
Cosner Dam, located in Fluvanna, Virginia, is a vital water resource structure regulated by the Department of Conservation and Recreation.
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Summary
This earth dam spans 164 feet in length and stands at a height of 23 feet, providing a storage capacity of 214 acre-feet primarily for recreational purposes. Situated on the Middle Fork river, the dam offers opportunities for outdoor activities and serves as a popular destination for water and climate enthusiasts in the region.
Despite its significant role in recreation, the condition assessment of Cosner Dam remains undetermined with an unknown hazard potential. Regular inspections are conducted to ensure the safety and integrity of the structure, with an inspection frequency of once per year. While the dam's emergency action plan status and risk assessment details are not readily available, the local authorities continue to monitor and manage any potential risks associated with the dam to safeguard the surrounding community and environment.
As a non-USACE structure, Cosner Dam serves as a key water management feature in Virginia, contributing to the conservation and utilization of water resources in the area. The dam's presence on the Middle Fork river not only enhances the recreational experience for visitors but also underscores the importance of sustainable water infrastructure development in the face of changing climate conditions. With ongoing regulatory oversight and maintenance efforts, Cosner Dam remains a valuable asset for water resource management and climate resilience in the region.
Dam Length |
164 |
Dam Height |
23 |
River Or Stream |
MIDDLE FORK |
Hydraulic Height |
23 |
Nid Storage |
214 |
Structural Height |
23 |
Hazard Potential |
Undetermined |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rivanna River At Palmyra
|
657cfs |
Hardware River Bl Briery Run Nr Scottsville
|
95cfs |
James River At Cartersville
|
3870cfs |
Slate River Near Arvonia
|
222cfs |
James River At Scottsville
|
3430cfs |
N F Rivanna River Near Earlysville
|
83cfs |
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.
Cosner Dam