Johnson (Oscar) Dam
Key Takeaway
Johnson (Oscar) Dam is classified as low hazard in Iowa. It was completed in 2011 and is 15 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Height | 49 ft (taller than 94.6% in IA) |
| Dam Length | 530 ft |
| Dam Type | Earth |
| Max Storage | 187 acre-ft |
| Normal Storage | 53 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 150 cfs |
| Year Completed | 2011 (15 years old) |
| NID ID | IA04188 |
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
Oscar Johnson
Private
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What is the hazard classification of Johnson (Oscar) Dam?
Johnson (Oscar) Dam 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 Johnson (Oscar) Dam?
Johnson (Oscar) Dam is owned by Oscar Johnson (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnson (Oscar) Dam built?
Johnson (Oscar) Dam was completed in 2011, making it 15 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 Johnson (Oscar) Dam?
Johnson (Oscar) Dam serves the following purposes: Flood Risk Reduction, Grade Stabilization, Fish And Wildlife Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Johnson (Oscar) Dam?
Johnson (Oscar) Dam has a dam height of 49 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.