Potacocawa Watershed Structure Y-31a-28 Dam Reservoir Report
Last Updated: December 5, 2025
Potacocawa Watershed Structure Y-31a-28 Dam, also known as Harper Dam, is a local government-owned earth dam located in Carroll County, Mississippi.
°F
°F
mph
Wind
%
Humidity
Summary
Constructed in 1974 by USDA NRCS, this dam serves the primary purpose of flood risk reduction along the TR-Potacocowa Creek. With a height of 25 feet and a storage capacity of 182 acre-feet, this structure plays a crucial role in managing water resources in the area.
Managed by the Mississippi Department of Environmental Quality, the dam is classified as having low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite its moderate risk status, the dam's uncontrolled spillway and outlet gates pose a potential threat that requires regular inspection and maintenance. Additionally, the dam meets state regulatory standards and is subject to state permitting, inspection, and enforcement protocols, ensuring its continued safe operation for flood risk reduction.
The Potacocawa Watershed Structure Y-31a-28 Dam is situated within the Vicksburg District and falls under the jurisdiction of Congressman Bennie G. Thompson. With its vital role in flood risk reduction and water resource management in the area, this dam remains a significant infrastructure for climate and water resource enthusiasts to monitor and study for its impact on the local environment and community.
Year Completed |
1974 |
Dam Height |
25 |
River Or Stream |
TR- POTACOCOWA CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.7 |
Drainage Area |
0.48 |
Nid Storage |
182 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Tallahatchie River At Money
|
6080cfs |
Yalobusha River At Grenada
|
3080cfs |
Batupan Bogue At Grenada
|
134cfs |
Abiaca Creek At Cruger
|
44cfs |
Big Sunflower River At Sunflower
|
1370cfs |
Big Black River At West
|
223cfs |
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.
Potacocawa Watershed Structure Y-31a-28 Dam