Potomac River Dam #4
Significant HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Maryland |
| County | Washington |
| Nearest City | WILLIAMSPORT, MD |
| River/Stream | POTOMAC RIVER |
| Coordinates | 39.49413, -77.82692 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 715 ft |
| Year Completed | 1869 (157 years old) |
Storage & Hydraulics
| NID Storage | 6,750 acre-ft |
| Max Storage | 6,750 acre-ft |
| Surface Area | 675 acres |
| Drainage Area | 5,900 sq mi |
| Max Discharge | 1,000,000 cfs |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | DOI NPS |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 07/26/2023 |
| Emergency Action Plan | Yes |