Emergency Sewage Retention Pond No.1 Structure is an earth dam located in Fairfax County, Virginia. It carries a Significant hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 1,250 ft long. 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 Emergency Sewage Retention Pond No.1 Structure
Emergency Sewage Retention Pond No.1 Structure is a dam in Fairfax, Virginia. The dam is owned by Upper Occoquan Sewage Authority (local government). It impounds the Tributary of Bull Run.
The dam stands 21 feet tall and stretches 1,250 feet across, and has a maximum storage capacity of 140 acre-feet.
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.
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Location
| State | Virginia |
| County | Fairfax |
| River/Stream | Tributary of Bull Run |
| Coordinates | 38.80310, -77.46190 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 1,250 ft |
Storage & Hydraulics
| NID Storage | 140 acre-ft |
| Max Storage | 140 acre-ft |
Ownership & Safety
| Purpose | Other |
| Owner | Upper Occoquan Sewage Authority |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | No |
Identifiers
| NID ID | VA059055 |
| Federal ID | VA059055 |
| More Info | State Dam Safety Program |