Grassy Knob Acres Dam Reservoir Report
Nearby: Jordan Dam Shuvart Dam
Last Updated: December 6, 2025
Grassy Knob Acres Dam, nestled in the picturesque town of Cliffside, North Carolina, is a privately-owned structure with a primary purpose of providing recreational opportunities for water and climate enthusiasts.
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Summary
Standing at a hydraulic height of 45 feet and a structural height of 53 feet, this earth dam boasts a capacity of 75 acre-feet and covers a surface area of 2.5 acres. Despite its significant hazard potential, the dam is currently assessed to be in fair condition as of the last inspection in February 2021.
Owned and regulated by the North Carolina Department of Environmental Quality's Dam Safety Program, Grassy Knob Acres Dam is subject to regular state inspection, permitting, and enforcement to ensure its safety and compliance with regulatory standards. The dam, located along the Broad River-Tr, falls under the jurisdiction of the Nashville District of the US Army Corps of Engineers and is associated with no other structures. In the event of an emergency, the dam's emergency action plan (EAP) status and risk assessment measures remain unspecified, highlighting the need for continued monitoring and management of this vital water resource.
Dam Length |
160 |
River Or Stream |
Broad River-Tr |
Primary Dam Type |
Earth |
Surface Area |
2.5 |
Hydraulic Height |
45 |
Nid Storage |
75 |
Structural Height |
53 |
Hazard Potential |
Significant |
Nid Height |
53 |
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.
Grassy Knob Acres Dam