Stonegate Swm Dam (Cherryfield Road) Reservoir Report

Last Updated: December 5, 2025

Stonegate Swm Dam (Cherryfield Road) in Oxon Hill-Glassmanor, Maryland, serves as a vital flood risk reduction structure along the Henson Creek-TR.


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Summary

Completed in 2003, this earth dam stands at a height of 25 feet and spans 175 feet in length, with a maximum storage capacity of 41 acre-feet and a normal storage level of 24.11 acre-feet. Its uncontrolled spillway, 60 feet wide, can handle a maximum discharge of 730.11 cubic feet per second, ensuring proper water management during heavy rainfall events.

Owned by the local government and regulated by the Maryland Dam Safety agency, Stonegate Swm Dam boasts a low hazard potential and satisfactory condition assessment. Its risk assessment indicates a moderate level of risk, prompting a five-year inspection frequency to ensure continued safety and functionality. With a surface area of 4.56 acres and a drainage area of 0.37 square miles, this dam plays a crucial role in protecting the surrounding community from potential flooding, while also providing valuable insights for water resource and climate enthusiasts interested in sustainable infrastructure development and management.

Year Completed

2003

Dam Length

175

Dam Height

25

River Or Stream

Henson Creek-TR

Primary Dam Type

Earth

Surface Area

4.56

Drainage Area

0.37

Nid Storage

41

Hazard Potential

Low

Foundations

Soil

Nid Height

25
       
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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.