Shipleys Crossing North Dam 2 (Wherry Ct) Reservoir Report

Last Updated: December 5, 2025

Shipleys Crossing North Dam 2 (Wherry Ct) is a private earth dam located in Old Mill, Anne Arundel County, Maryland.


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Summary

Built in 2008 by designer David Hursh Chisholm, this dam serves the primary purpose of flood risk reduction along the Marley Creek-TR. With a height of 14 feet and a length of 325 feet, the dam has a storage capacity of 2 acre-feet and a normal storage of 0.4 acre-feet. It covers a surface area of 0.5 acres and has a drainage area of 0.08 square miles.

The dam is regulated by the Maryland Dam Safety agency and undergoes regular inspections to ensure its structural integrity. The hazard potential is considered significant, but the condition assessment as of July 2018 was satisfactory. The emergency action plan (EAP) for the dam was last revised in May 2021, and the risk assessment categorizes the dam as having a moderate risk level. Despite its moderate risk level, the dam plays a crucial role in mitigating flood risks in the area, protecting the surrounding community from potential water-related disasters.

Overall, Shipleys Crossing North Dam 2 (Wherry Ct) is a vital infrastructure for flood control and water resource management in the region. With its strategic location and effective design, the dam provides essential protection against potential inundation events and contributes to the overall safety and well-being of the local residents. As climate change continues to pose challenges to water resources, the proper maintenance and regulation of dams like this one are essential for adapting to a changing climate and ensuring the resilience of communities against water-related hazards.

Year Completed

2008

Dam Length

325

Dam Height

14

River Or Stream

Marley Creek-TR

Primary Dam Type

Earth

Surface Area

0.5

Drainage Area

0.08

Nid Storage

2

Hazard Potential

Significant

Foundations

Soil

Nid Height

14
       
Seasonal Comparison

Weather Forecast

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.