Lake Bonnie Reservoir Report
Last Updated: January 12, 2026
Lake Bonnie in Greensboro, Maryland, is a private recreational lake nestled in Caroline County.
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Summary
Built in 1850, this earth dam stands at a height of 14 feet and spans 418 feet in length, providing a serene escape for water resource and climate enthusiasts. With a storage capacity of 495 acre-feet and a surface area of 25.8 acres, Lake Bonnie offers a tranquil setting for outdoor activities such as fishing, boating, and swimming.
Managed by the Maryland Dam Safety agency, Lake Bonnie boasts a low hazard potential and a moderate risk assessment rating. Despite its age, the dam remains in good condition and is regularly inspected to ensure public safety. The spillway, with a width of 44 feet, is uncontrolled, allowing for controlled water release during heavy rainfall events. Located on the Broadway Branch river, the lake serves as a vital water resource for the surrounding area while also providing a picturesque backdrop for recreational enjoyment.
Visitors to Lake Bonnie can appreciate its historical significance and natural beauty, as well as the careful engineering that went into its construction. With its peaceful waters and lush surroundings, this private oasis is a haven for those seeking a connection with nature and a deeper appreciation for water resource management in the face of changing climate conditions.
Years Modified |
2000 - Other |
Year Completed |
1850 |
Dam Length |
418 |
Dam Height |
14 |
River Or Stream |
Broadway Branch |
Primary Dam Type |
Earth |
Surface Area |
25.8 |
Drainage Area |
11.7 |
Nid Storage |
495 |
Outlet Gates |
Slide (sluice gate) - 0 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
14 |
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.
Lake Bonnie