Mill Creek Dam Reservoir Report
Last Updated: December 5, 2025
Mill Creek Dam, located in Dorchester, Maryland, was completed in 1930 and stands at a height of 11 feet, with a length of 300 feet.
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Summary
The primary purpose of this earth dam is for recreational use, specifically serving the Mill Creek area. With a storage capacity of 78 acre-feet and a drainage area of 3.3 square miles, the dam plays a crucial role in managing water resources in the region.
While the dam has a low hazard potential, it is regulated by the Maryland Dam Safety agency, ensuring that it is inspected, permitted, and enforced to meet safety standards. Despite not having a condition assessment rating, the dam underwent hydraulic modifications in 1999. With a moderate risk assessment rating of 3, the dam is equipped to handle a maximum discharge of 131 cubic feet per second with an uncontrolled spillway width of 7 feet. The Mill Creek Dam serves as a vital structure for both recreation and water management in the area, highlighting the importance of maintaining and monitoring its integrity for the community and the environment.
Years Modified |
1999 - Hydraulic |
Year Completed |
1930 |
Dam Length |
300 |
Dam Height |
11 |
River Or Stream |
Mill Creek |
Primary Dam Type |
Earth |
Surface Area |
11 |
Drainage Area |
3.3 |
Nid Storage |
78 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
11 |
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.
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