Marsillett Dam Reservoir Report
Last Updated: December 13, 2025
Marsillett Dam, also known as Marsillett Lake, is a private-owned structure located in Bonanza, Floyd County, Kentucky.
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Summary
Built in 1971 by the Soil Conservation Service, this earth-type dam stands at a height of 25 feet and spans 170 feet in length, creating a reservoir with a storage capacity of 10 acre-feet. The primary purpose of Marsillett Dam is for recreation, offering a surface area of 1.1 acres for outdoor activities.
Despite its recreational significance, Marsillett Dam poses a high hazard potential and has been assessed to be in poor condition as of March 2017. The dam features an uncontrolled spillway with a width of 15 feet, and its drainage area is approximately 0.13 square miles. The Kentucky Division of Water regulates and inspects the dam periodically to ensure its safety and compliance with state regulations. While the risk assessment for Marsillett Dam is moderate, the dam's condition and hazard potential highlight the importance of ongoing maintenance and risk management measures to protect the surrounding community and environment.
Year Completed |
1971 |
Dam Length |
170 |
Dam Height |
25 |
River Or Stream |
STATE ROAD FORK |
Primary Dam Type |
Earth |
Surface Area |
1.1 |
Drainage Area |
0.13 |
Nid Storage |
10 |
Hazard Potential |
High |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Licking River Below Mason Fork Nr Salyersville
|
44cfs |
Levisa Fork At Paintsville
|
1790cfs |
Johns Creek Near Meta
|
23cfs |
Levisa Fork At Pikeville
|
1390cfs |
North Fork Kentucky River At Jackson
|
515cfs |
Tug Fork At Kermit
|
527cfs |
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.
Marsillett Dam