Jansma Dam
Key Takeaway
Jansma Dam is classified as low hazard in Iowa. It was completed in 1970 and is 56 years old. Its primary use is fire protection.
Physical Details
| Dam Height | 22 ft (taller than 10.6% in IA) |
| Dam Length | 834 ft |
| Dam Type | Earth |
| Max Storage | 132 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1970 (56 years old) |
| NID ID | IA00605 |
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
Floyd Jansma
Private
Frequently Asked Questions
What is the hazard classification of Jansma Dam?
Jansma 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 Jansma Dam?
Jansma Dam is owned by Floyd Jansma (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Jansma Dam built?
Jansma Dam was completed in 1970, making it 56 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 Jansma Dam?
Jansma Dam serves the following purposes: Fire Protection, Stock, Or Small Fish Pond, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Jansma Dam?
Jansma Dam 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 Jansma Dam last inspected?
Jansma Dam was last inspected on April 9, 1987. Inspection dates indicate when a formal review occurred, not the results of that inspection.