Seph Mack
Key Takeaway
Seph Mack is classified as significant hazard in Pennsylvania. It was completed in 1987 and is 39 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 21 ft (taller than 46.9% in PA) |
| Dam Length | 305 ft |
| Dam Type | Earth |
| Max Storage | 15 acre-ft |
| Normal Storage | 9 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Year Completed | 1987 (39 years old) |
| NID ID | PA01397 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
DCNR
State Government
Nearby Dams
Yellow Creek
Indiana, PA
High Hazard 62 ftElroy Face
Indiana, PA
High Hazard 25 ftTwo Lick Creek
Indiana, PA
High Hazard 90 ftAltemus
Indiana, PA
Significant Hazard 30 ftFreshwater Impoundment
Indiana, PA
High Hazard 50 ftSlurry Pond #2
Indiana, PA
Significant Hazard 40 ftMusser Forests
Indiana, PA
High Hazard 22 ftEdwards
Indiana, PA
Low Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Seph Mack?
Seph Mack is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Seph Mack?
Seph Mack is owned by DCNR (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Seph Mack built?
Seph Mack was completed in 1987, making it 39 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 Seph Mack?
Seph Mack serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Seph Mack?
Seph Mack has a dam height of 21 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 Seph Mack last inspected?
Seph Mack was last inspected on February 20, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.