Long Dam Reservoir Report
Nearby: Northampton Dam # 3 Jones Dam # 2
Last Updated: January 12, 2026
Long Dam, located in Northampton, Virginia, serves as a crucial irrigation resource along the Old Plantation Creek.
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Summary
Managed by the Department of Conservation and Recreation, this earth dam stands at a height of 10 feet and spans a length of 506 feet, providing a storage capacity of 87 acre-feet. Despite its relatively small size, Long Dam plays a significant role in supporting agricultural activities in the region.
Although the dam's hazard potential is currently listed as undetermined and its condition assessment is not rated, it is subject to regular inspections and state enforcement to ensure its structural integrity and safety. With a primary purpose of irrigation, Long Dam continues to play a vital role in water resource management and climate resilience efforts in the area. As water resource and climate enthusiasts, monitoring Long Dam and its associated structures is essential for understanding the impact of these infrastructure assets on the local ecosystem and community.
Dam Length |
506 |
Dam Height |
10 |
River Or Stream |
OLD PLANTATION CREEK |
Hydraulic Height |
10 |
Nid Storage |
87 |
Structural Height |
10 |
Hazard Potential |
Undetermined |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Long Dam