Muddy Run Main Dam
Key Takeaway
Muddy Run Main Dam is classified as high hazard in Pennsylvania. It was completed in 1967 and is 59 years old. Its primary use is hydroelectric. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 260 ft (taller than 99.2% in PA) |
| Dam Length | 4,800 ft |
| Dam Type | Rockfill |
| Max Storage | 60.5K acre-ft |
| Normal Storage | 60.5K acre-ft |
| Surface Area | 1,000 acres |
| Drainage Area | 9 sq mi |
| Max Discharge | 20,000 cfs |
| Year Completed | 1967 (59 years old) |
| NID ID | PA00266 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Constellation Energy Generation, LLC (NYRO)
Public Utility
Nearby Dams
Holtwood Ses Ash Basin No 2
Lancaster, PA
High Hazard 57 ftDam PA02010
Lancaster, PA
Low Hazard 29 ftMuddy Run Recreation Dam
Lancaster, PA
Low Hazard 90 ftHoltwood
Lancaster, PA
Low Hazard 55 ftPeach Bottom Atomic Power
York, PA
Low Hazard 34 ftBroad Creek Dam
Harford, MD
High Hazard 36 ftSafe Harbor
Lancaster, PA
Significant Hazard 75 ftGrande View Farms Community Pond
Harford, MD
Significant Hazard 22 ftFrequently Asked Questions
What is the hazard classification of Muddy Run Main Dam?
Muddy Run Main Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Muddy Run Main Dam?
Muddy Run Main Dam is owned by Constellation Energy Generation, LLC (NYRO) (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Muddy Run Main Dam built?
Muddy Run Main Dam was completed in 1967, making it 59 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Muddy Run Main Dam?
Muddy Run Main Dam serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Muddy Run Main Dam?
Muddy Run Main Dam has a dam height of 260 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Muddy Run Main Dam last inspected?
Muddy Run Main Dam was last inspected on August 20, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.