Upper John Tanner Lake Dam Reservoir Report
Last Updated: December 13, 2025
Upper John Tanner Lake Dam, located in Carrollton, Georgia, is a local government-owned structure primarily used for recreation purposes.
°F
°F
mph
Wind
%
Humidity
Summary
This earth dam, with a height of 21.8 feet and a hydraulic height of 17.5 feet, creates a reservoir with a storage capacity of 156.8 acre-feet and a surface area of 15.2 acres. While the dam is classified as having a low hazard potential, it is subject to regular state inspections to ensure its safety and functionality.
Despite being unlisted as a regulated structure by the state, Upper John Tanner Lake Dam is equipped with an uncontrolled spillway and outlet gates. The dam's risk assessment is categorized as moderate, with a condition assessment that remains unrated. With its picturesque setting and recreational opportunities, this dam serves as an important feature in the local landscape, attracting water resource and climate enthusiasts who appreciate its role in providing both leisure activities and water storage in the region. As the dam continues to be monitored and maintained, its significance in the community remains paramount for residents and visitors alike.
Dam Length |
375 |
Dam Height |
21.8 |
River Or Stream |
UNKNOWN |
Primary Dam Type |
Earth |
Surface Area |
15.2 |
Hydraulic Height |
17.5 |
Nid Storage |
156.8 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
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.
Upper John Tanner Lake Dam