Mary's Creek #10 Reservoir Report

Last Updated: December 6, 2025

Mary's Creek #10, also known as Thomas A Gemignani Dam, is a local government-owned structure located in Germantown, Shelby County, Tennessee.


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Summary

Designed by USDA NRCS in 1961, this earth dam serves the primary purpose of flood risk reduction on the tributary of Mary's Creek. The dam has a hydraulic height of 16.1 feet and a structural height of 26.3 feet, with a length of 742 feet and a storage capacity of 213 acre-feet.

With a significant hazard potential and a satisfactory condition assessment as of September 2020, Mary's Creek #10 is regulated by the Tennessee Safe Dams Program. This dam is inspected biennially to ensure its safety and compliance with state regulations. The risk assessment for this structure is moderate, and there are currently no emergency action plans in place.

For water resource and climate enthusiasts, Mary's Creek #10 offers insights into flood risk reduction strategies and dam infrastructure management in Tennessee. As a vital component of the local water management system, this dam plays a crucial role in protecting the surrounding area from potential inundation events. Its design and construction by the Natural Resources Conservation Service highlight the collaborative efforts to enhance water resource management in the region.

Year Completed

1961

Dam Length

742

River Or Stream

TRIBMARY'S CREEK

Primary Dam Type

Earth

Surface Area

10.9

Hydraulic Height

16.1

Drainage Area

0.37

Nid Storage

213

Structural Height

26.3

Outlet Gates

None

Hazard Potential

Significant

Foundations

Soil

Nid Height

26
       
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.