Upper Mulberry River 7 Reservoir Report

Last Updated: December 5, 2025

Upper Mulberry River 7, located in Gwinnett, Georgia, is a crucial structure managed by the USDA NRCS, designed for flood risk reduction along Duncan Creek.


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Summary

Built in 1980, this earth dam stands at a height of 40 feet and spans 542 feet in length, with a storage capacity of 1236 acre-feet. The dam serves a primary purpose of flood risk reduction and is associated with the Natural Resources Conservation Service, emphasizing its importance in managing water resources in the region.

With a drainage area of 2.81 square miles and a maximum discharge capacity of 2000 cubic feet per second, Upper Mulberry River 7 plays a vital role in mitigating flood hazards and protecting the surrounding community. Despite its high hazard potential, the dam's condition assessment is currently not available, highlighting the need for regular inspections and maintenance to ensure its structural integrity and effectiveness. While the risk assessment for this structure is moderate, efforts towards risk management measures and emergency preparedness are essential to safeguard against potential threats and ensure the safety of the area.

In the face of climate variability and increasing water-related challenges, facilities like Upper Mulberry River 7 are essential for sustainable water resource management. As a key component in flood mitigation strategies, this dam serves as a critical safeguard against potential disasters, emphasizing the importance of proactive measures and investments in infrastructure to protect communities and ecosystems from the impacts of extreme weather events and changing climate patterns.

Year Completed

1980

Dam Length

542

Dam Height

40

River Or Stream

Duncan Creek

Primary Dam Type

Earth

Surface Area

33

Drainage Area

2.81

Nid Storage

1236

Hazard Potential

High

Nid Height

40
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.