Strong Arm No 2 (lower) is a dam located in Franklin County, Idaho, built in 1897. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 27 ft27 ft tall and 660 ft long, taller than 59% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Strong Arm No 2 (lower)
The primary purpose of Strong Arm No 2 (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 Battle Creek Bear River near Warm Springs.
The dam stands 27 feet tall and stretches 660 feet across, creates a reservoir covering 24 acres, has a storage capacity of 377 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1897, the structure is over a century 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 06/25/2020.
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Location
| State | Idaho |
| County | Franklin |
| Nearest City | Warm Springs |
| River/Stream | Battle Creek Bear River |
| Coordinates | 42.21820, -111.90030 |
Physical Characteristics
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 660 ft |
| Year Completed | 1897 (129 years old) |
Storage & Hydraulics
| NID Storage | 377 acre-ft |
| Normal Storage | 377 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 06/25/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00227 |
| Federal ID | ID00227 |
| More Info | State Dam Safety Program |