Edgehill Farm Dam Reservoir Report

Last Updated: December 5, 2025

Edgehill Farm Dam, formerly known as Holiday Acres, is a private-owned recreational dam located in Wake County, North Carolina.


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Summary

Built in 1960, this earth dam stands at a structural height of 28 feet with a hydraulic height of 25 feet. It spans 450 feet in length and has a maximum storage capacity of 81 acre-feet, providing ample water resources for recreational activities. The dam is situated on Coles Branch and is regulated by the NCDEQ Dam Safety Program, with regular state inspections ensuring its satisfactory condition.

With a significant hazard potential, Edgehill Farm Dam serves as a vital water resource for the community of Morrisville. Its primary purpose is for recreation, offering a surface area of 3 acres for activities such as fishing, boating, and picnicking. The dam has a normal storage capacity of 67 acre-feet and a maximum discharge of 152 cubic feet per second. Despite its age, the dam has been well-maintained, with the last inspection conducted in February 2018 confirming its satisfactory condition.

Located within the Wilmington District of the US Army Corps of Engineers, Edgehill Farm Dam plays a crucial role in providing water-based recreational opportunities while also ensuring public safety through regular inspections and enforcement of state regulations. As a key feature on Coles Branch, this dam continues to be a valuable asset for the community, highlighting the importance of responsible water resource management and climate resilience in the face of changing environmental conditions.

Year Completed

1960

Dam Length

450

River Or Stream

Coles Branch

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

25

Nid Storage

81

Structural Height

28

Hazard Potential

Significant

Nid Height

28
       
Seasonal Comparison

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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.