Black Watershed Structure Y-36-39 Dam Reservoir Report
Last Updated: December 6, 2025
Black Watershed Structure Y-36-39 Dam, also known as Hammett Dam, is a local government-owned structure in Holmes, Mississippi, designed by USDA NRCS to mitigate flood risks along the TR-Black Creek.
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Summary
Completed in 1967, this Earth-type dam stands at a height of 35 feet and has a storage capacity of 538 acre-feet. While the dam is uncontrolled and has low hazard potential, it is regulated and inspected by the Mississippi Department of Environmental Quality to ensure its structural integrity and compliance with state regulations.
Located in Howard, Mississippi, the Black Watershed Structure Y-36-39 Dam plays a crucial role in flood risk reduction within the region. Its primary purpose is to protect the surrounding area from potential inundation during periods of high water flow, safeguarding both property and livelihoods. The dam's moderate risk assessment rating suggests a need for ongoing monitoring and maintenance to uphold its effectiveness and safety standards. Despite its uncontrolled spillway and lack of a formal condition assessment, the dam remains a key component of the local water resource infrastructure.
As a vital part of the Vicksburg District's water management system, Black Watershed Structure Y-36-39 Dam stands as a testament to the collaborative efforts between federal and local agencies in safeguarding communities from the impacts of extreme weather events. With its historical significance and ongoing importance in flood control, this dam serves as a symbol of resilience and adaptability in the face of changing climate patterns. By recognizing and supporting such critical water resource structures, enthusiasts can contribute to the preservation and enhancement of our natural environment for future generations.
Year Completed |
1967 |
Dam Height |
35 |
River Or Stream |
TR- BLACK CREEK |
Primary Dam Type |
Earth |
Drainage Area |
1.59 |
Nid Storage |
538 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Harland Creek Nr Howard
|
3340cfs |
Abiaca Creek At Cruger
|
44cfs |
Big Black River At West
|
190cfs |
Yockanookany River Nr Kosciusko
|
54cfs |
Tallahatchie River At Money
|
5720cfs |
Big Black River Nr Bentonia
|
502cfs |
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.
Black Watershed Structure Y-36-39 Dam