Grindstone River
Key Takeaway
Grindstone River is classified as significant hazard in Minnesota. It was completed in 1955 and is 71 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 18 ft (taller than 57.4% in MN) |
| Dam Length | 58 ft |
| Dam Type | Gravity |
| Max Storage | 428 acre-ft |
| Normal Storage | 305 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 95 sq mi |
| Max Discharge | 1,500 cfs |
| Year Completed | 1955 (71 years old) |
| NID ID | MN00543 |
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
MNDNR-Fisheries
State Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Grindstone River?
Grindstone River 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 Grindstone River?
Grindstone River is owned by MNDNR-Fisheries (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Grindstone River built?
Grindstone River was completed in 1955, making it 71 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 Grindstone River?
Grindstone River 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 Grindstone River?
Grindstone River has a dam height of 18 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 Grindstone River last inspected?
Grindstone River was last inspected on August 12, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.