Twin Falls
Key Takeaway
Twin Falls is classified as low hazard in Idaho. It was completed in 1935 and is 91 years old. Its primary use is hydroelectric.
Physical Details
| Dam Height | 16 ft (taller than 13.6% in ID) |
| Dam Length | 809 ft |
| Dam Type | Concrete |
| Max Storage | 955 acre-ft |
| Normal Storage | 955 acre-ft |
| Surface Area | 85 acres |
| Drainage Area | 19,000 sq mi |
| Max Discharge | 60,000 cfs |
| Year Completed | 1935 (91 years old) |
| NID ID | ID00051 |
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
Idaho Power Company
Private
Nearby Dams
Shoshone Falls Dam 4
Twin Falls, ID
Low Hazard 18 ftShoshone Falls Dam 3
Jerome, ID
Low Hazard 15 ftShoshone Falls Dam 2
Jerome, ID
Low Hazard 16 ftShoshone Falls Dam 1
Jerome, ID
Low Hazard 16 ftSirucek Reservoir
Jerome, ID
Low Hazard 17 ftWilson Lake
Jerome, ID
Significant Hazard 31 ftMurtaugh Lake
Twin Falls, ID
High Hazard 42 ftFrequently Asked Questions
What is the hazard classification of Twin Falls?
Twin Falls 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 Twin Falls?
Twin Falls is owned by Idaho Power Company (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Twin Falls built?
Twin Falls was completed in 1935, making it 91 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 Twin Falls?
Twin Falls serves the following purposes: Hydroelectric, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Twin Falls?
Twin Falls has a dam height of 16 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 Twin Falls last inspected?
Twin Falls was last inspected on September 19, 2017. Inspection dates indicate when a formal review occurred, not the results of that inspection.