Mike Johnson Dam Reservoir Report
Nearby: Lloyd Pond Dam Andersons Dam
Last Updated: December 20, 2025
Mike Johnson Dam, located in Fluvanna, Virginia, is a private earth dam primarily used for recreation.
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Summary
Standing at a height of 19 feet and stretching 400 feet in length, this dam has a storage capacity of 62 acre-feet. Situated on a tributary of Mechunk Creek, the dam is under state regulation and jurisdiction, with oversight from the Department of Conservation and Recreation.
Although the hazard potential of the dam is currently undetermined and its condition is not rated, emergency action plans have been prepared and updated periodically to ensure the safety of the surrounding community. The dam has not been modified in recent years, and there are no associated structures or federal agency involvement in its ownership or operation. With the dam's location in a picturesque area of Virginia, water resource and climate enthusiasts can appreciate its contribution to recreational activities and environmental conservation efforts in the region.
Dam Length |
400 |
Dam Height |
19 |
River Or Stream |
trib. Mechunk Creek |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Nid Storage |
62 |
Structural Height |
19 |
Hazard Potential |
Undetermined |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rivanna River At Palmyra
|
520cfs |
N F Rivanna River Near Earlysville
|
123cfs |
Hardware River Bl Briery Run Nr Scottsville
|
124cfs |
James River At Scottsville
|
3600cfs |
Moormans River Near Free Union
|
67cfs |
Mechums River Near White Hall
|
145cfs |
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.
Mike Johnson Dam