Upper Leaf River Structure 7 Dam Reservoir Report
Nearby: Mccormick Lake Ms07306 Lake Dam
Last Updated: December 6, 2025
The Upper Leaf River Structure 7 Dam, also known as Greentree Lake, is a local government-owned dam located in Sylvarena, Mississippi.
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Summary
Built in 1974 by the USDA NRCS, this earth dam stands at a height of 30 feet and spans a length of 1237 feet, with a storage capacity of 2365 acre-feet. Its primary purpose is flood risk reduction and it is regulated by the Mississippi Department of Environmental Quality.
With a low hazard potential and fair condition assessment, the Upper Leaf River Structure 7 Dam plays a crucial role in managing flood risks in the area. The dam's uncontrolled spillway and outlet gates help regulate water flow, with a maximum discharge capacity of 3117 cfs. The dam covers a drainage area of 4.46 square miles and has a surface area of 38.3 acres, providing essential water resource management in Smith County, Mississippi.
Despite its moderate risk assessment, the Upper Leaf River Structure 7 Dam remains a vital infrastructure for flood management in the region. Regular inspections and maintenance ensure its continued functionality in reducing flood risks and protecting the surrounding communities. As a key component of the local water resource infrastructure, this dam demonstrates the importance of sustainable water management practices in the face of changing climate conditions.
Year Completed |
1974 |
Dam Length |
1237 |
Dam Height |
30 |
River Or Stream |
UNT OF CHUSA CREEK |
Primary Dam Type |
Earth |
Surface Area |
38.3 |
Drainage Area |
4.46 |
Nid Storage |
2365 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Tallahala Creek At Waldrup
|
164cfs |
Leaf River Nr Collins
|
349cfs |
Chunky River Nr Chunky
|
301cfs |
Chickasawhay River At Enterprise
|
546cfs |
South Canal Tuscolameta Creek Nr Walnut Grove
|
8cfs |
Tallahala Creek At Laurel
|
17cfs |
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.
Upper Leaf River Structure 7 Dam