Gillespie Upper Dam Reservoir Report
Nearby: Mchard Lake # 1 Dam Flowers Lake Dam
Last Updated: December 6, 2025
Located in Jones, Mississippi, the Gillespie Upper Dam is a privately owned structure regulated by the Mississippi Department of Environmental Quality.
°F
°F
mph
Wind
%
Humidity
Summary
Built in 2003, this earth dam stands at a height of 35.3 feet and has a primary purpose of recreation. With a maximum storage capacity of 43 acre-feet and a surface area of 2.28 acres, the dam serves as a recreational spot for water resource and climate enthusiasts to enjoy.
The dam, situated on the UNT of Leaf River, has a low hazard potential and a moderate risk assessment rating. While it does not have outlet gates or associated structures, its uncontrolled spillway type can handle a maximum discharge of 12 cubic feet per second. Despite not being rated for condition assessment, the dam is regularly inspected by the state regulatory agency to ensure its safety and compliance with regulations.
For those interested in water resources and climate, Gillespie Upper Dam provides a unique opportunity to explore and appreciate the intersection of human-made structures with the natural environment. With its scenic location and recreational purpose, the dam offers a glimpse into the careful balance between human activity and environmental stewardship in the state of Mississippi.
Year Completed |
2003 |
Dam Length |
450 |
Dam Height |
35.3 |
River Or Stream |
UNT OF LEAF RIVER |
Surface Area |
2.28 |
Hydraulic Height |
28 |
Drainage Area |
0.04 |
Nid Storage |
43 |
Structural Height |
40.3 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Okatoma Creek At Sanford
|
541cfs |
Bouie Creek Nr Hattiesburg
|
438cfs |
Leaf River Nr Collins
|
374cfs |
Tallahala Creek At Laurel
|
17cfs |
Leaf River At Hattiesburg
|
1360cfs |
Tallahala Creek Nr Runnelstown
|
93cfs |
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.
Gillespie Upper Dam