Allyn Dam
Key Takeaway
Allyn Dam is classified as low hazard in Nebraska. It was completed in 1968 and is 58 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Height | 25 ft (taller than 46.7% in NE) |
| Dam Length | 1,042 ft |
| Dam Type | Earth |
| Max Storage | 138 acre-ft |
| Normal Storage | 37 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 826 cfs |
| Year Completed | 1968 (58 years old) |
| NID ID | NE00420 |
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
Holt County
Private
Nearby Dams
Weller Dam
Holt, NE
Low Hazard 24 ftWeller Dam 2
Holt, NE
Low Hazard 22 ftOlberding Dam
Holt, NE
Low Hazard 29 ftSandy Ridge Lagoon 1 Dam
Holt, NE
Significant Hazard 40 ftRichard Miles Dam Repair
Holt, NE
Low Hazard 19 ftSmith Dam 1
Holt, NE
Low Hazard 31 ftShald Irrigation Dam
Holt, NE
Low Hazard 47 ftMmk Dam 1
Holt, NE
Low Hazard 30 ftFrequently Asked Questions
What is the hazard classification of Allyn Dam?
Allyn 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 Allyn Dam?
Allyn Dam is owned by Holt County (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Allyn Dam built?
Allyn Dam was completed in 1968, making it 58 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 Allyn Dam?
Allyn Dam serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Allyn Dam?
Allyn Dam has a dam height of 25 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 Allyn Dam last inspected?
Allyn Dam was last inspected on May 18, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.