New Wall Lake
Key Takeaway
New Wall Lake is classified as low hazard in South Dakota. It was completed in 1947 and is 79 years old. Its primary use is recreation.
Physical Details
| Dam Height | 40 ft (taller than 96.5% in SD) |
| Dam Length | 570 ft |
| Dam Type | Earth |
| Max Storage | 460 acre-ft |
| Normal Storage | 280 acre-ft |
| Max Discharge | 1,365 cfs |
| Year Completed | 1947 (79 years old) |
| NID ID | SD01071 |
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 28 ftFrequently Asked Questions
What is the hazard classification of New Wall Lake?
New Wall 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 New Wall Lake?
New Wall Lake is owned by GF&P (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was New Wall Lake built?
New Wall Lake was completed in 1947, making it 79 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 Wall Lake?
New Wall 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 New Wall Lake?
New Wall Lake has a dam height of 40 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 Wall Lake last inspected?
New Wall Lake was last inspected on November 18, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.