Thompson Lake Dam Reservoir Report
Nearby: Catfish Lake Dam Rick Lake Dam
Last Updated: December 5, 2025
Thompson Lake Dam, located in Lonoke, Arkansas, is a private earth dam built in 1953 for the primary purpose of irrigation.
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Summary
The dam stands at 17 feet in height and spans 400 feet in length, with a storage capacity of 80 acre-feet. Situated on Jacksnipe Branch, the dam is under the jurisdiction of the Little Rock District of the US Army Corps of Engineers. Although it is not state-regulated, the dam is considered to have significant hazard potential.
Despite being privately owned, Thompson Lake Dam plays a crucial role in supporting agricultural activities in the area by providing water for irrigation. The dam has not been inspected or rated for its condition, and emergency preparedness measures such as an Emergency Action Plan (EAP) have not been documented. As water resource and climate enthusiasts, understanding the infrastructure and potential risks associated with dams like Thompson Lake Dam is essential for ensuring the safety and sustainability of our water resources. Further monitoring and evaluation of the dam's condition and hazard potential may be necessary to mitigate any potential risks to the surrounding community and environment.
Year Completed |
1953 |
Dam Length |
400 |
Dam Height |
17 |
River Or Stream |
JACKSNIPE BRANCH |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
80 |
Structural Height |
17 |
Hazard Potential |
Significant |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Thompson Lake Dam