Marshall Millpond Dam
Marshall Millpond Dam is a gravity dam located in Sussex County, Delaware. It carries a Significant hazard potential classification and has a fair condition assessment.
About Marshall Millpond Dam
The primary purpose of Marshall Millpond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Deldot (state). It impounds the Herring Branch.
The dam stands 14 feet tall and stretches 440 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 169 acre-feet, and collects water from a drainage area of 7 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 05/30/2024.
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Location
| State | Delaware |
| County | Sussex |
| Nearest City | None |
| River/Stream | Herring Branch |
| Coordinates | 38.90823, -75.41254 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 440 ft |
Storage & Hydraulics
| NID Storage | 169 acre-ft |
| Max Storage | 169 acre-ft |
| Normal Storage | 126 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 550 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | DELDOT |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/30/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | DE00093 |
| Federal ID | DE00093 |
| More Info | State Dam Safety Program |