Duncan & Howell Lake Dam Reservoir Report
Last Updated: December 6, 2025
Duncan & Howell Lake Dam, located in Irwin, Georgia, was completed in 1986 and primarily serves the purpose of recreation.
°F
°F
mph
Wind
%
Humidity
Summary
Owned privately, this earth dam stands at a height of 15.2 feet and spans 450 feet in length. It has a storage capacity of 109 acre-feet, with a normal storage level of 55 acre-feet, encompassing a surface area of 10 acres.
With an uncontrolled spillway and outlet gates, the dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. The last inspection was conducted in October 2020, with a frequency of every 5 years. Despite being state-jurisdictioned, the dam is not regulated by the state and has not undergone any modifications since its construction. With a moderate risk assessment score of 3, the dam's risk management measures and emergency preparedness remain unaddressed. For water resource and climate enthusiasts, Duncan & Howell Lake Dam presents an intriguing case study in private dam ownership and the challenges of managing recreational water structures.
Year Completed |
1986 |
Dam Length |
450 |
Dam Height |
15.2 |
River Or Stream |
UNKNOWN |
Primary Dam Type |
Earth |
Surface Area |
10 |
Nid Storage |
109 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
15 |
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.
Duncan & Howell Lake Dam