Lake Isabelle
Key Takeaway
Lake Isabelle is classified as low hazard in Colorado. It was completed in 1925 and is 101 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 38 ft (taller than 79.2% in CO) |
| Dam Length | 0 ft |
| Dam Type | Rockfill |
| Max Storage | 738 acre-ft |
| Normal Storage | 594 acre-ft |
| Surface Area | 36 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,262 cfs |
| Year Completed | 1925 (101 years old) |
| NID ID | CO01929 |
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
LEFT HAND DITCH COMPANY (TERRY PLUMMER)
Private
Nearby Dams
Green Lake No. 3
Boulder, CO
Low Hazard 28 ftGreen Lake No. 2
Boulder, CO
Low Hazard 52 ftGreen Lake No. 1
Boulder, CO
Low Hazard 24 ftAlbion Lake
Boulder, CO
Significant Hazard 36 ftGoose Lake
Boulder, CO
Significant Hazard 32 ftBrainard Lake
Boulder, CO
Significant Hazard 15 ftIsland Lake
Boulder, CO
Low Hazard 18 ftSilver Lake
Boulder, CO
High Hazard 70 ftFrequently Asked Questions
What is the hazard classification of Lake Isabelle?
Lake Isabelle 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 Lake Isabelle?
Lake Isabelle is owned by LEFT HAND DITCH COMPANY (TERRY PLUMMER) (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Lake Isabelle built?
Lake Isabelle was completed in 1925, making it 101 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 Lake Isabelle?
Lake Isabelle serves the following purposes: Irrigation, Fire Protection, Stock, Or Small Fish Pond, Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Lake Isabelle?
Lake Isabelle has a dam height of 38 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 Lake Isabelle last inspected?
Lake Isabelle was last inspected on September 24, 1990. Inspection dates indicate when a formal review occurred, not the results of that inspection.