Cottonwood Creek Lower
Key Takeaway
Cottonwood Creek Lower is classified as significant hazard in Idaho. It was completed in 1961 and is 65 years old. Its primary use is flood risk reduction. Significant hazard means failure could cause economic or environmental damage. Learn more.
Physical Details
| Dam Height | 15 ft (taller than 10.5% in ID) |
| Dam Length | 1,710 ft |
| Normal Storage | 88 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 17 sq mi |
| Max Discharge | 3,540 cfs |
| Year Completed | 1961 (65 years old) |
| NID ID | ID00477 |
Safety Information
No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Local Government
Nearby Dams
Cottonwood Creek Middle
Ada, ID
Significant Hazard 20 ftCottonwood Creek Upper
Ada, ID
Significant Hazard 18 ftCrane Gulch East Dam
Ada, ID
Significant Hazard 60 ftStewart Gulch Main Fork
Ada, ID
Significant Hazard 76 ftCrane Gulch Main Fork
Ada, ID
Significant Hazard 46 ftStewart Gulch North Fork
Ada, ID
Significant Hazard 38 ftBarber
Ada, ID
Significant Hazard 26 ftBoise River Diversion
Ada, ID
High Hazard 57 ftFrequently Asked Questions
What is the hazard classification of Cottonwood Creek Lower?
Cottonwood Creek Lower is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Cottonwood Creek Lower?
Cottonwood Creek Lower is owned by information not available (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Cottonwood Creek Lower built?
Cottonwood Creek Lower was completed in 1961, making it 65 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 Cottonwood Creek Lower?
Cottonwood Creek Lower serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Cottonwood Creek Lower?
Cottonwood Creek Lower has a dam height of 15 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 Cottonwood Creek Lower last inspected?
Cottonwood Creek Lower was last inspected on September 11, 2018. Inspection dates indicate when a formal review occurred, not the results of that inspection.