J.T. Hirst Dam

N Fork Catoctin Creek· Loudoun, Virginia· Earth· 34 ft tall
Significant Hazard Water Supply Local Government

Key Takeaway

J.T. Hirst Dam is classified as significant hazard in Virginia. Its primary use is water supply. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 34 ft (taller than 78.3% in VA)
Dam Length600 ft
Dam TypeEarth
Max Storage155 acre-ft
Normal Storage128 acre-ft
Surface Area9 acres
Drainage Area1 sq mi
NID IDVA107019

Safety Information

Significant Hazard

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: Yes
Last Inspection: January 14, 2022
State Regulated: Yes
Regulatory Agency: Department of Conservation and Recreation

Ownership

Town of Purcellville;Town of Purcellville

Local Government

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Frequently Asked Questions

What is the hazard classification of J.T. Hirst Dam?

J.T. Hirst Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates J.T. Hirst Dam?

J.T. Hirst Dam is owned by Town of Purcellville;Town of Purcellville (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of J.T. Hirst Dam?

J.T. Hirst Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is J.T. Hirst Dam?

J.T. Hirst Dam has a dam height of 34 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

When was J.T. Hirst Dam last inspected?

J.T. Hirst Dam was last inspected on January 14, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.