Johnston Dam
Key Takeaway
Johnston Dam is classified as low hazard in Iowa. It was completed in 2005 and is 21 years old. Its primary use is grade stabilization.
Physical Details
| Dam Height | 29 ft (taller than 42.8% in IA) |
| Dam Length | 220 ft |
| Dam Type | Earth |
| Max Storage | 29 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 137 cfs |
| Year Completed | 2005 (21 years old) |
| NID ID | IA04059 |
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
Mike Johnston
Private
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What is the hazard classification of Johnston Dam?
Johnston 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 Johnston Dam?
Johnston Dam is owned by Mike Johnston (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnston Dam built?
Johnston Dam was completed in 2005, making it 21 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 Johnston Dam?
Johnston Dam serves the following purposes: Grade Stabilization. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Johnston Dam?
Johnston Dam has a dam height of 29 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.