Soda
Soda is a concrete dam located in Caribou County, Idaho, built in 1925. It carries a High hazard potential classification and has a fair condition assessment.
About Soda
The primary purpose of Soda is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Pacificorp (private). It impounds the Bear River near Grace.
The dam stands 103 feet tall and stretches 492 feet across, creates a reservoir covering 1,100 acres, has a maximum storage capacity of 16,300 acre-feet, and collects water from a drainage area of 3,970 square miles. Completed in 1925, the structure is over a century old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 06/28/2022.
At 103 feet, this dam is taller than 98% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Idaho dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Idaho |
| County | Caribou |
| Nearest City | Grace |
| River/Stream | Bear River |
| Coordinates | 42.64440, -111.69660 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 103 ft |
| Dam Height | 103 ft |
| Dam Length | 492 ft |
| Year Completed | 1925 (101 years old) |
Storage & Hydraulics
| NID Storage | 16,300 acre-ft |
| Max Storage | 16,300 acre-ft |
| Normal Storage | 15,200 acre-ft |
| Surface Area | 1,100 acres |
| Drainage Area | 3,970 sq mi |
| Max Discharge | 45,150 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | PacifiCorp |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 06/28/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ID00060 |
| Federal ID | ID00060 |
| More Info | State Dam Safety Program |