Dorchester 4-A
Key Takeaway
Dorchester 4-A is classified as low hazard in Nebraska. It was completed in 1969 and is 57 years old. Its primary use is flood risk reduction.
Physical Details
| Dam Height | 30 ft (taller than 66.9% in NE) |
| Dam Length | 632 ft |
| Dam Type | Earth |
| Max Storage | 368 acre-ft |
| Normal Storage | 67 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 656 cfs |
| Year Completed | 1969 (57 years old) |
| NID ID | NE00041 |
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
Upper Big Blue Natural Resources District
Local Government
Nearby Dams
Dorchester 3-A
Saline, NE
Low Hazard 29 ftDorchester 2-A
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Significant Hazard 31 ftDorchester 1-A
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Significant Hazard 31 ftVavra Semler Road Dam A
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Low Hazard 21 ftVavra-Semler Dam B
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Low Hazard 19 ftFrew Dam
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Low Hazard 15 ftHansen Dam 9814
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Low Hazard 22 ftWayne Hansen Dam
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Low Hazard 25 ftFrequently Asked Questions
What is the hazard classification of Dorchester 4-A?
Dorchester 4-A 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 Dorchester 4-A?
Dorchester 4-A is owned by Upper Big Blue Natural Resources District (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Dorchester 4-A built?
Dorchester 4-A was completed in 1969, making it 57 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 Dorchester 4-A?
Dorchester 4-A 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 Dorchester 4-A?
Dorchester 4-A has a dam height of 30 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 Dorchester 4-A last inspected?
Dorchester 4-A was last inspected on April 4, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.