Greenwood Reservoir Dam
Key Takeaway
Greenwood Reservoir Dam is classified as significant hazard in Michigan. It was completed in 1973 and is 53 years old. Its primary use is water supply. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 60 ft (taller than 97.6% in MI) |
| Dam Length | 4,400 ft |
| Dam Type | Earth |
| Max Storage | 22.8K acre-ft |
| Normal Storage | 18.0K acre-ft |
| Surface Area | 1,112 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 23,700 cfs |
| Year Completed | 1973 (53 years old) |
| NID ID | MI00487 |
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
Tilden Magnetite Partnership
Private
Nearby Dams
Greenwood Afterbay Dam
Marquette, MI
Significant Hazard 41 ftEtb Waterway Dams
Marquette, MI
Low Hazard 20 ftTilden Recirculation Basin
Marquette, MI
High Hazard 95 ftOgden Lake Dam
Marquette, MI
High Hazard 9 ftLake Sally Dam
Marquette, MI
High Hazard 15 ftBig Drake Dam
Marquette, MI
Low Hazard 9 ftTrout Lake Dam
Marquette, MI
Low Hazard 11 ftSchweitzer Dam
Marquette, MI
Significant Hazard 54 ftFrequently Asked Questions
What is the hazard classification of Greenwood Reservoir Dam?
Greenwood Reservoir Dam 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 Greenwood Reservoir Dam?
Greenwood Reservoir Dam is owned by Tilden Magnetite Partnership (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Greenwood Reservoir Dam built?
Greenwood Reservoir Dam was completed in 1973, making it 53 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 Greenwood Reservoir Dam?
Greenwood Reservoir Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Greenwood Reservoir Dam?
Greenwood Reservoir Dam has a dam height of 60 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 Greenwood Reservoir Dam last inspected?
Greenwood Reservoir Dam was last inspected on December 1, 2016. Inspection dates indicate when a formal review occurred, not the results of that inspection.