Six Mile - Northwest
Key Takeaway
Six Mile - Northwest is classified as low hazard in Colorado. It was completed in 1892 and is 134 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 14 ft (taller than 17% in CO) |
| Dam Length | 1,750 ft |
| Dam Type | Earth |
| Max Storage | 2.2K acre-ft |
| Normal Storage | 1.4K acre-ft |
| Surface Area | 124 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 11,552 cfs |
| Year Completed | 1892 (134 years old) |
| NID ID | CO02824 |
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
BOULDER & WHITE ROCK DITCH & RESERVOIR CO. (GRANT,
Private
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High Hazard 27 ftFrequently Asked Questions
What is the hazard classification of Six Mile - Northwest?
Six Mile - Northwest 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 Six Mile - Northwest?
Six Mile - Northwest is owned by BOULDER & WHITE ROCK DITCH & RESERVOIR CO. (GRANT, (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Six Mile - Northwest built?
Six Mile - Northwest was completed in 1892, making it 134 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 Six Mile - Northwest?
Six Mile - Northwest serves the following purposes: Irrigation, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Six Mile - Northwest?
Six Mile - Northwest has a dam height of 14 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 Six Mile - Northwest last inspected?
Six Mile - Northwest was last inspected on October 3, 2019. Inspection dates indicate when a formal review occurred, not the results of that inspection.