Green Lake No. 1
Key Takeaway
Green Lake No. 1 is classified as low hazard in Colorado. It was completed in 1940 and is 86 years old. Its primary use is water supply.
Physical Details
| Dam Height | 24 ft (taller than 49.9% in CO) |
| Dam Length | 270 ft |
| Dam Type | Rockfill |
| Max Storage | 60 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 149 cfs |
| Year Completed | 1940 (86 years old) |
| NID ID | CO01778 |
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
CITY OF BOULDER (CLARK, KEVIN)
Local Government
Nearby Dams
Green Lake No. 2
Boulder, CO
Low Hazard 52 ftAlbion Lake
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Significant Hazard 36 ftGreen Lake No. 3
Boulder, CO
Low Hazard 28 ftGoose Lake
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Significant Hazard 32 ftLake Isabelle
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Low Hazard 38 ftIsland Lake
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Low Hazard 18 ftSilver Lake
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High Hazard 70 ftBrainard Lake
Boulder, CO
Significant Hazard 15 ftFrequently Asked Questions
What is the hazard classification of Green Lake No. 1?
Green Lake No. 1 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 Green Lake No. 1?
Green Lake No. 1 is owned by CITY OF BOULDER (CLARK, KEVIN) (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Green Lake No. 1 built?
Green Lake No. 1 was completed in 1940, making it 86 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 Green Lake No. 1?
Green Lake No. 1 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 Green Lake No. 1?
Green Lake No. 1 has a dam height of 24 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 Green Lake No. 1 last inspected?
Green Lake No. 1 was last inspected on July 15, 1985. Inspection dates indicate when a formal review occurred, not the results of that inspection.