William Long Dam Reservoir Report
Nearby: Ms05016 Lake Dam Ms05017 Lake Dam
Last Updated: December 6, 2025
Located in Carroll, Mississippi, the William Long Dam stands as a testament to effective water resource management in the region.
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Summary
Completed in 2007, this private-owned Earth-type dam serves a variety of purposes, with a primary focus on regulating the flow of the UNT of Big Sand Creek. Standing at a height of 18 feet and boasting a storage capacity of 200 acre-feet, the dam plays a crucial role in maintaining the ecological balance of the area.
Managed by the Mississippi Department of Environmental Quality, the William Long Dam has been designed to withstand various environmental challenges, with a moderate risk assessment rating. The dam's uncontrolled spillway and structural design ensure efficient water discharge and management during periods of high flow. With a drainage area of 0.55 square miles and a maximum discharge capacity of 97.6 cubic feet per second, the dam is a vital asset in mitigating flood risks and preserving the surrounding ecosystem.
Despite its undetermined hazard potential and not yet rated condition assessment, the William Long Dam remains a key infrastructure for water resource enthusiasts and climate advocates alike. With its strategic location and essential role in water regulation, the dam stands as a symbol of sustainable development and responsible stewardship of natural resources in the region.
Year Completed |
2007 |
Dam Length |
465 |
Dam Height |
18 |
River Or Stream |
UNT OF BIG SAND CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.03 |
Hydraulic Height |
14 |
Drainage Area |
0.55 |
Nid Storage |
200 |
Structural Height |
20 |
Hazard Potential |
Undetermined |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Tallahatchie River At Money
|
5720cfs |
Abiaca Creek At Cruger
|
44cfs |
Batupan Bogue At Grenada
|
98cfs |
Yalobusha River At Grenada
|
2960cfs |
Big Black River At West
|
190cfs |
Harland Creek Nr Howard
|
3340cfs |
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.
William Long Dam