Lost Lake Dam Reservoir Report
Last Updated: December 5, 2025
Lost Lake Dam, also known as Kelly Lake Dam, is a private earth dam located in Jefferson, Georgia, near the city of Louisville.
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Summary
Built in 1966 by the Natural Resources Conservation Service, this recreational dam stands at a height of 22 feet with a hydraulic height of 20 feet. The dam stretches 850 feet in length and has a storage capacity of 320 acre-feet, providing ample space for water-based activities on the 27-acre surface area of Lost Lake.
Despite its low hazard potential and moderate risk assessment, Lost Lake Dam has not been rated for its condition. However, it is regularly inspected every five years, with the last inspection conducted in February 2003. The dam's primary purpose is for recreation, offering a serene setting for water enthusiasts to enjoy the natural beauty of Manson Branch, the river or stream that Lost Lake Dam helps to regulate. With its uncontrolled spillway and outlet gates, Lost Lake Dam serves as a vital structure for water resource management in the region.
Year Completed |
1966 |
Dam Length |
850 |
Dam Height |
22 |
River Or Stream |
MANSON BRANCH |
Primary Dam Type |
Earth |
Surface Area |
27 |
Hydraulic Height |
20 |
Nid Storage |
320 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Williamson Swamp Creek At Davisboro
|
83cfs |
Ogeechee River At Midville
|
662cfs |
Brier Creek Near Waynesboro
|
399cfs |
Spirit Creek At Us 1
|
11cfs |
Beaverdam Creek Near Sardis
|
7cfs |
Buffalo Creek At Ga 272
|
145cfs |
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.
Lost Lake Dam