Upper Salmon Falls A-plant & Forebay
Upper Salmon Falls A-plant & Forebay is a concrete dam located in Twin Falls County, Idaho, built in 1937. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Upper Salmon Falls A-plant & Forebay
The primary purpose of Upper Salmon Falls A-plant & Forebay is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Idaho Power Company (private). It impounds the Snake River.
The dam stands 85 feet tall and stretches 310 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 26 acre-feet, and collects water from a drainage area of 32,200 square miles. Completed in 1937, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/20/2017.
At 85 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | Idaho |
| County | Twin Falls |
| Nearest City | None |
| River/Stream | Snake River |
| Coordinates | 42.76750, -114.92470 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 85 ft |
| Dam Height | 85 ft |
| Dam Length | 310 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 26 acre-ft |
| Max Storage | 26 acre-ft |
| Normal Storage | 26 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 32,200 sq mi |
| Max Discharge | 6,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Idaho Power Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/20/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID83074 |
| Federal ID | ID83074 |
| More Info | State Dam Safety Program |