Lake Hanson
Key Takeaway
Lake Hanson is classified as low hazard in South Dakota. It was completed in 1932 and is 94 years old. Its primary use is recreation.
Physical Details
| Dam Height | 24 ft (taller than 53.3% in SD) |
| Dam Length | 780 ft |
| Dam Type | Earth |
| Max Storage | 340 acre-ft |
| Normal Storage | 250 acre-ft |
| Max Discharge | 420 cfs |
| Year Completed | 1932 (94 years old) |
| Year Modified | 1996 |
| NID ID | SD00691 |
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
S&PL
State Government
Nearby Dams
Frequently Asked Questions
What is the hazard classification of Lake Hanson?
Lake Hanson 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 Lake Hanson?
Lake Hanson is owned by S&PL (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Hanson built?
Lake Hanson was completed in 1932, making it 94 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 Lake Hanson?
Lake Hanson 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 Lake Hanson?
Lake Hanson has a dam height of 24 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 Lake Hanson last inspected?
Lake Hanson was last inspected on November 3, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.