Thomson Dam No 1-1/2
Key Takeaway
Thomson Dam No 1-1/2 is classified as low hazard in Minnesota. It was completed in 1907 and is 119 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 10 ft (taller than 30.9% in MN) |
| Dam Length | 90 ft |
| Dam Type | Earth |
| Max Storage | 4.4K acre-ft |
| Normal Storage | 4.4K acre-ft |
| Surface Area | 375 acres |
| Year Completed | 1907 (119 years old) |
| NID ID | MN00604 |
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
Allete, Inc.
Private
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Thomson Dam No 1-1/2?
Thomson Dam No 1-1/2 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 Thomson Dam No 1-1/2?
Thomson Dam No 1-1/2 is owned by Allete, Inc. (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Thomson Dam No 1-1/2 built?
Thomson Dam No 1-1/2 was completed in 1907, making it 119 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 Thomson Dam No 1-1/2?
Thomson Dam No 1-1/2 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 Thomson Dam No 1-1/2?
Thomson Dam No 1-1/2 has a dam height of 10 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 Thomson Dam No 1-1/2 last inspected?
Thomson Dam No 1-1/2 was last inspected on September 21, 2021. Inspection dates indicate when a formal review occurred, not the results of that inspection.