J.t. Hirst Dam is an earth dam located in Loudoun County, Virginia. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 34 ft34 ft tall and 600 ft long, taller than 78% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About J.t. Hirst Dam
The primary purpose of J.t. Hirst Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Town of Purcellville;town of Purcellville (local government). It impounds the N Fork Catoctin Creek.
The dam stands 34 feet tall and stretches 600 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 155 acre-feet, and collects water from a drainage area of 1 square miles.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 01/14/2022.
At 34 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Virginia |
| County | Loudoun |
| River/Stream | N Fork Catoctin Creek |
| Coordinates | 39.19830, -77.77600 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 34 ft |
| Dam Height | 34 ft |
| Dam Length | 600 ft |
Storage & Hydraulics
| NID Storage | 155 acre-ft |
| Max Storage | 155 acre-ft |
| Normal Storage | 128 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Town of Purcellville;town of Purcellville |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 01/14/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | VA107019 |
| Federal ID | VA107019 |
| More Info | State Dam Safety Program |