Ralston
Key Takeaway
Ralston is classified as high hazard in Colorado. It was completed in 1937 and is 89 years old. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.
Physical Details
| Dam Height | 180 ft (taller than 98.4% in CO) |
| Dam Length | 1,170 ft |
| Dam Type | Earth |
| Max Storage | 15.9K acre-ft |
| Normal Storage | 10.7K acre-ft |
| Surface Area | 160 acres |
| Drainage Area | 46 sq mi |
| Max Discharge | 37,500 cfs |
| Year Completed | 1937 (89 years old) |
| NID ID | CO00205 |
Safety Information
Loss of human life is likely if the dam fails.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
DENVER BOARD OF WATER COMMISSIONERS
Public Utility
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High Hazard 113 ftFrequently Asked Questions
What is the hazard classification of Ralston?
Ralston is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Ralston?
Ralston is owned by DENVER BOARD OF WATER COMMISSIONERS (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Ralston built?
Ralston was completed in 1937, making it 89 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 Ralston?
Ralston serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Ralston?
Ralston has a dam height of 180 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 Ralston last inspected?
Ralston was last inspected on April 21, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.