Portland
Key Takeaway
Portland is classified as low hazard in Michigan. It was completed in 1919 and is 107 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 9 ft (taller than 14.1% in MI) |
| Dam Length | 680 ft |
| Dam Type | Gravity |
| Max Storage | 186 acre-ft |
| Normal Storage | 117 acre-ft |
| Surface Area | 30 acres |
| Drainage Area | 1,700 sq mi |
| Max Discharge | 2,400 cfs |
| Year Completed | 1919 (107 years old) |
| NID ID | MI00099 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Not Listed
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Portland?
Portland is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Portland?
Portland is owned by information not available (Not Listed). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Portland built?
Portland was completed in 1919, making it 107 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 Portland?
Portland serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Portland?
Portland has a dam height of 9 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 Portland last inspected?
Portland was last inspected on July 20, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.