Shiner Upper
Shiner Upper is a dam located in Lemhi County, Idaho, built in 1968. It carries a Significant hazard potential classification and has a fair condition assessment.
About Shiner Upper
The primary purpose of Shiner Upper 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 Yearian Creek Lemhi River near Yearian.
The dam stands 29 feet tall and stretches 400 feet across, creates a reservoir covering 25 acres, has a storage capacity of 250 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1968, 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 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 11/05/2020.
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Location
| State | Idaho |
| County | Lemhi |
| Nearest City | Yearian |
| River/Stream | Yearian Creek Lemhi River |
| Coordinates | 44.88660, -113.54010 |
Physical Characteristics
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 400 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Normal Storage | 250 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 39 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 11/05/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00142 |
| Federal ID | ID00142 |
| More Info | State Dam Safety Program |