Andreasen Lower
Andreasen Lower is a dam located in Franklin County, Idaho, built in 1960. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Andreasen Lower
The primary purpose of Andreasen Lower is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is private-owned. It impounds the Rocky Canyon Creek Cottonwood Creek near Thatcher.
The dam stands 33 feet tall and stretches 720 feet across, creates a reservoir covering 10 acres, has a storage capacity of 100 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1960, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 08/08/2017.
At 33 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Idaho |
| County | Franklin |
| Nearest City | Thatcher |
| River/Stream | Rocky Canyon Creek Cottonwood Creek |
| Coordinates | 42.32380, -111.77830 |
Physical Characteristics
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 720 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Normal Storage | 100 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 12 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/08/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00157 |
| Federal ID | ID00157 |
| More Info | State Dam Safety Program |