New Underwood
Key Takeaway
New Underwood is classified as low hazard in South Dakota. It was completed in 1946 and is 80 years old. Its primary use is recreation.
Physical Details
| Dam Height | 22 ft (taller than 45.6% in SD) |
| Dam Length | 1,000 ft |
| Dam Type | Earth |
| Max Storage | 164 acre-ft |
| Normal Storage | 59 acre-ft |
| Surface Area | 59 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 380 cfs |
| Year Completed | 1946 (80 years old) |
| NID ID | SD00034 |
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
GF&P
State Government
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Low Hazard 20 ftFrequently Asked Questions
What is the hazard classification of New Underwood?
New Underwood 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 New Underwood?
New Underwood is owned by GF&P (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was New Underwood built?
New Underwood was completed in 1946, making it 80 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 New Underwood?
New Underwood 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 New Underwood?
New Underwood has a dam height of 22 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 New Underwood last inspected?
New Underwood was last inspected on November 18, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.