Lower Dunbar Dam
Key Takeaway
Lower Dunbar Dam is classified as low hazard in Iowa. It was completed in 1996 and is 30 years old. Its primary use is recreation.
Physical Details
| Dam Height | 7 ft |
| Dam Length | 3,200 ft |
| Dam Type | Earth |
| Max Storage | 189 acre-ft |
| Normal Storage | 104 acre-ft |
| Surface Area | 52 acres |
| Drainage Area | 13 sq mi |
| Max Discharge | 0 cfs |
| Year Completed | 1996 (30 years old) |
| NID ID | IA03077 |
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
Iowa Department of Natural Resources
State Government
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What is the hazard classification of Lower Dunbar Dam?
Lower Dunbar 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 Lower Dunbar Dam?
Lower Dunbar Dam is owned by Iowa Department of Natural Resources (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lower Dunbar Dam built?
Lower Dunbar Dam was completed in 1996, making it 30 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 Lower Dunbar Dam?
Lower Dunbar Dam 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 Lower Dunbar Dam?
Lower Dunbar Dam has a dam height of 7 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.