Lower John Tanner Lake Dam Reservoir Report
Last Updated: December 13, 2025
Lower John Tanner Lake Dam, located in Carrollton, Georgia, is a local government-owned structure primarily designed for recreation purposes.
°F
°F
mph
Wind
%
Humidity
Summary
This Earth dam, with a height of 19.9 feet and a hydraulic height of 14.8 feet, serves as a popular spot for water resource and climate enthusiasts to enjoy outdoor activities. With a maximum storage capacity of 82 acre-feet and a normal storage level of 60 acre-feet, the dam offers a serene 9.2-acre surface area for recreational activities such as boating and fishing.
Although the dam has a low hazard potential and is categorized as "Not Rated" in terms of condition assessment, it has an associated moderate risk factor. Despite lacking recent inspection data, the dam's design - featuring an uncontrolled spillway and outlet gates - ensures its functionality for recreational purposes. With its location in the Mobile District and proximity to the unknown river or stream, Lower John Tanner Lake Dam stands as a testament to responsible water resource management and offers a unique environment for climate enthusiasts to appreciate and enjoy the beauty of nature.
Dam Length |
453 |
Dam Height |
19.9 |
River Or Stream |
UNKNOWN |
Primary Dam Type |
Earth |
Surface Area |
9.2 |
Hydraulic Height |
14.8 |
Nid Storage |
82 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
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.
Lower John Tanner Lake Dam