Rock Lake 15
Key Takeaway
Rock Lake 15 is classified as low hazard in Minnesota. It was completed in 1988 and is 38 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Height | 13 ft (taller than 45.7% in MN) |
| Dam Length | 800 ft |
| Dam Type | Rockfill |
| Max Storage | 500 acre-ft |
| Drainage Area | 26 sq mi |
| Year Completed | 1988 (38 years old) |
| NID ID | MN01784 |
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
County of Lyon
Local Government
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Low Hazard 37 ftFrequently Asked Questions
What is the hazard classification of Rock Lake 15?
Rock Lake 15 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 Rock Lake 15?
Rock Lake 15 is owned by County of Lyon (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Rock Lake 15 built?
Rock Lake 15 was completed in 1988, making it 38 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 Rock Lake 15?
Rock Lake 15 serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Rock Lake 15?
Rock Lake 15 has a dam height of 13 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 Rock Lake 15 last inspected?
Rock Lake 15 was last inspected on April 4, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.