Sage Hen is a dam located in Gem County, Idaho, built in 1939. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 46 ft46 ft tall and 425 ft long, taller than 91% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Sage Hen
Sage Hen is a dam in Gem, Idaho. The dam is private-owned. It impounds the Sage Hen Creek Second Fork Squaw Creek near Ola.
The dam stands 46 feet tall and stretches 425 feet across, creates a reservoir covering 238 acres, has a storage capacity of 5,210 acre-feet, and collects water from a drainage area of 10 square miles. Completed in 1939, the structure is well-established, with more than 75 years of service.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 07/17/2018.
At 46 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Idaho |
| County | Gem |
| Nearest City | Ola |
| River/Stream | Sage Hen Creek Second Fork Squaw Creek |
| Coordinates | 44.32600, -116.19510 |
Physical Characteristics
| NID Height | 46 ft |
| Dam Height | 46 ft |
| Dam Length | 425 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 5,210 acre-ft |
| Normal Storage | 5,210 acre-ft |
| Surface Area | 238 acres |
| Drainage Area | 10 sq mi |
| Max Discharge | 1,670 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 07/17/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00115 |
| Federal ID | ID00115 |
| More Info | State Dam Safety Program |