Lake Tanner Dam Reservoir Report
Last Updated: December 5, 2025
Lake Tanner Dam, located in Butler, Alabama, was completed in 1965 and serves as a recreational spot for water resource and climate enthusiasts.
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Summary
This private earth dam stands at a structural height of 23 feet with a hydraulic height of 20 feet, providing a storage capacity of 368 acre-feet. Situated on the TR-FOURMILE MILL BRANCH river, the dam spans 375 feet and has a maximum discharge of 1390 cubic feet per second.
Despite its low hazard potential, Lake Tanner Dam is not currently rated for condition assessment. The dam does not have a designated spillway and is not regulated or inspected by any state agency. However, its emergency action plan status, risk assessment, and management measures remain unknown. With Martha Roby representing Congressional District 02 in Alabama, Lake Tanner Dam offers a serene recreational space for visitors to enjoy the beauty of its surroundings and the tranquility of its waters.
Year Completed |
1965 |
Dam Length |
375 |
River Or Stream |
TR-FOURMILE MILL BRANCH |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
368 |
Structural Height |
23 |
Hazard Potential |
Low |
Nid Height |
23 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Patsaliga Creek Near Brantley Al
|
402cfs |
Conecuh River At Brantley Al
|
482cfs |
Sepulga River Near Mckenzie Al
|
169cfs |
Conecuh River Bel Pt A Dam Nr River Falls
|
1740cfs |
Conecuh River At River Falls
|
1730cfs |
Pine Barren Creek Near Snow Hill
|
88cfs |
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.
Lake Tanner Dam