Thunder Lake
Key Takeaway
Thunder Lake is classified as low hazard in Minnesota. It was completed in 1934 and is 92 years old. Its primary use is recreation.
Physical Details
| Dam Height | 18 ft (taller than 57.4% in MN) |
| Dam Type | Earth |
| Max Storage | 8.6K acre-ft |
| Normal Storage | 7.8K acre-ft |
| Surface Area | 1,347 acres |
| Drainage Area | 17 sq mi |
| Year Completed | 1934 (92 years old) |
| NID ID | MN01091 |
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
MNDNR-Fisheries
State Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Thunder Lake?
Thunder Lake 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 Thunder Lake?
Thunder Lake is owned by MNDNR-Fisheries (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thunder Lake built?
Thunder Lake was completed in 1934, making it 92 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 Thunder Lake?
Thunder Lake 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 Thunder Lake?
Thunder Lake 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 Thunder Lake last inspected?
Thunder Lake was last inspected on April 15, 2015. Inspection dates indicate when a formal review occurred, not the results of that inspection.