Mary's Creek #7 Reservoir Report
Nearby: Mary's Creek #9 Birnham Woods
Last Updated: December 13, 2025
Mary's Creek #7, also known as Mary's Creek W/S Dam 7, is a local government-owned earth dam located in Shelby, Tennessee.
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Summary
Built in 1959 by the USDA NRCS, this dam serves the primary purpose of flood risk reduction along the TRIBMARY'S CREEK. With a hydraulic height of 14 feet and a structural height of 25 feet, Mary's Creek #7 has a storage capacity of 540 acre-feet and covers a surface area of 20.8 acres.
The dam is regulated by the TENNESSEE SAFE DAMS PROGRAM and undergoes regular inspections to ensure its safety and functionality. Despite being classified with a significant hazard potential, the condition assessment in January 2020 rated it as satisfactory. The dam has no outlet gates and relies on an uncontrolled spillway for water discharge. With a drainage area of 0.72 square miles, Mary's Creek #7 plays a crucial role in managing water resources and mitigating flood risks in the region.
Overall, Mary's Creek #7 is a vital infrastructure for flood risk reduction in the area, designed to protect the community from potential inundation events. With a moderate risk level and satisfactory condition assessment, this dam stands as a testament to effective water resource management and climate resilience efforts in Tennessee. Its strategic location and design make it a key player in safeguarding the surrounding environment and ensuring the safety of residents in CROSSROADS.
Year Completed |
1959 |
Dam Length |
1220 |
River Or Stream |
TRIBMARY'S CREEK |
Primary Dam Type |
Earth |
Surface Area |
20.8 |
Hydraulic Height |
14 |
Drainage Area |
0.72 |
Nid Storage |
540 |
Structural Height |
25 |
Outlet Gates |
None |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
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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.
Mary's Creek #7