New Castle County Water Farm Wastewater Lagoon is a gravity dam located in New Castle County, Delaware. It carries a High hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 29 ft29 ft tall and 4,300 ft long, taller than 65% 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 concrete gravity section and the water level is illustrative.
About New Castle County Water Farm Wastewater Lagoon
New Castle County Water Farm Wastewater Lagoon is a dam in New Castle, Delaware. The dam is owned by New Castle County Dept of Special Services (local government). It impounds the Appoquinimink River-os near Mathews Corner.
The dam stands 29 feet tall and stretches 4,300 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 448 acre-feet, and collects water from a drainage area of 0 square miles.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Delaware dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Delaware |
| County | New Castle |
| Nearest City | Mathews Corner |
| River/Stream | Appoquinimink River-os |
| Coordinates | 39.45114, -75.63997 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 4,300 ft |
Storage & Hydraulics
| NID Storage | 448 acre-ft |
| Max Storage | 448 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Other |
| Owner | New Castle County Dept of Special Services |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | DE00103 |
| Federal ID | DE00103 |
| More Info | State Dam Safety Program |