Left Hand
Key Takeaway
Left Hand is classified as low hazard in Colorado. It was completed in 1900 and is 126 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 10 ft (taller than 4.4% in CO) |
| Dam Length | 600 ft |
| Dam Type | Earth |
| Max Storage | 78 acre-ft |
| Normal Storage | 25 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 42 cfs |
| Year Completed | 1900 (126 years old) |
| NID ID | CO02270 |
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 COUNTY PARKS AND OPEN SPACE (ALEXANDER, RO
Local Government
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What is the hazard classification of Left Hand?
Left Hand 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 Left Hand?
Left Hand is owned by BOULDER COUNTY PARKS AND OPEN SPACE (ALEXANDER, RO (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Left Hand built?
Left Hand was completed in 1900, making it 126 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 Left Hand?
Left Hand serves the following purposes: Irrigation, Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Left Hand?
Left Hand has a dam height of 10 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 Left Hand last inspected?
Left Hand was last inspected on September 26, 2013. Inspection dates indicate when a formal review occurred, not the results of that inspection.