Edgemoor Reservoir Dam Reservoir Report

Last Updated: December 5, 2025

Edgemoor Reservoir Dam, located in Edgemoor, Delaware, was completed in 1908 and primarily serves as a water supply source.


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Summary

This private gravity dam stands at a height of 13.43 feet and has a storage capacity of 82 acre-feet, with a surface area of 0.52 acres. The dam, situated on the Turkey Run-OS stream, is part of the New Castle County in Delaware and falls under the jurisdiction of the Baltimore District.

Despite its high hazard potential and lack of recent condition assessment, Edgemoor Reservoir Dam has not been rated for its current condition. However, with a limited drainage area of 0.01 square miles, the dam poses a significant risk, as indicated by its risk assessment rating of High (2). With no spillway in place, the dam's emergency action plan and risk management measures are unclear, raising concerns for the surrounding community in case of a potential breach. For water resource and climate enthusiasts, monitoring the maintenance and safety measures of Edgemoor Reservoir Dam is essential to ensure the protection of both the environment and local residents.

Year Completed

1908

Dam Length

1820

Dam Height

13.43

River Or Stream

TURKEY RUN-OS

Primary Dam Type

Gravity

Surface Area

0.52

Drainage Area

0.01

Nid Storage

82

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

13
       
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.