Miry Branch Dam Reservoir Report
Nearby: Smith Dam Langdon Lake Dam #2
Last Updated: December 5, 2025
Miry Branch Dam, located in Johnston, North Carolina, is a privately owned earth dam designed for flood risk reduction.
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Summary
Standing at a structural height of 20.5 feet with a hydraulic height of 19 feet, the dam plays a crucial role in managing water flow in the area. With a normal storage capacity of 23 acre-feet and a maximum storage of 27 acre-feet, the dam covers a surface area of 3.2 acres and serves a drainage area of 12 square miles.
Despite its fair condition assessment as of December 2020, Miry Branch Dam is classified as having a high hazard potential. The dam is regulated by the North Carolina Department of Environmental Quality's Dam Safety Program, ensuring regular inspections and enforcement of safety standards. The last inspection took place in December 2020, with an inspection frequency of every two years to ensure the dam's integrity and functionality.
Enthusiasts of water resources and climate adaptation will find Miry Branch Dam to be a valuable asset in flood risk management within the region. Its strategic location and design contribute to the overall resilience of the area's water infrastructure. By understanding the dam's specifications and regulatory framework, stakeholders can appreciate the importance of maintaining and monitoring such critical infrastructure to mitigate potential hazards and ensure community safety.
Dam Length |
625 |
Primary Dam Type |
Earth |
Surface Area |
3.2 |
Hydraulic Height |
19 |
Drainage Area |
12 |
Nid Storage |
27 |
Structural Height |
20.5 |
Hazard Potential |
High |
Nid Height |
21 |
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.
Miry Branch Dam