Upper Yockanookany Ws Str 1 Dam Reservoir Report
Last Updated: December 5, 2025
The Upper Yockanookany WS Str 1 Dam, located in Ackerman, Mississippi, is a key structure for flood risk reduction along the Yockanookany River.
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Summary
Built in 1975 by the USDA NRCS, this earth dam stands at a height of 25 feet and has a storage capacity of 249 acre-feet. With a high hazard potential and satisfactory condition assessment, the dam is closely monitored by the Mississippi Department of Environmental Quality, which regulates its operation, inspection, and enforcement.
This dam plays a crucial role in protecting the surrounding area from flooding, with a maximum discharge capacity of 5,190 cubic feet per second. The spillway, designed as uncontrolled, ensures controlled release of water during periods of high flow. The dam's primary purpose is flood risk reduction, reflecting its importance in safeguarding the community against potential water-related disasters. Its location in Choctaw County also highlights the significance of water resource management in this region.
As a part of the National Inventory of Dams, the Upper Yockanookany WS Str 1 Dam undergoes regular inspections to ensure its structural integrity and safety. With an inspection frequency of 5 years and a risk assessment rating of moderate, measures are in place to manage potential risks effectively. The dam's presence as a vital infrastructure for water resource management in Mississippi underscores the importance of sustainable practices and climate resilience in safeguarding communities and ecosystems.
Year Completed |
1975 |
Dam Length |
755 |
Dam Height |
25 |
River Or Stream |
YOCKANOOKANY RIVER |
Primary Dam Type |
Earth |
Surface Area |
14 |
Hydraulic Height |
20 |
Drainage Area |
0.72 |
Nid Storage |
249 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Yockanookany River Nr Kosciusko
|
45cfs |
Catalpa Creek At Mayhew
|
2940cfs |
Pearl River At Burnside
|
1070cfs |
Big Black River At West
|
223cfs |
Pearl River At Edinburg
|
182cfs |
Noxubee River At Macon
|
146cfs |
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 Yockanookany Ws Str 1 Dam