Shaw Twins Upper
Shaw Twins Upper is a dam located in Valley County, Idaho, built in 1930. It carries a Low hazard potential classification and has a fair condition assessment.
About Shaw Twins Upper
The primary purpose of Shaw Twins 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 Unnamed Stream Lake Fork Creek.
The dam stands 17 feet tall and stretches 75 feet across, creates a reservoir covering 20 acres, has a storage capacity of 188 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1930, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 07/16/2018.
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Location
| State | Idaho |
| County | Valley |
| Nearest City | None |
| River/Stream | Unnamed Stream Lake Fork Creek |
| Coordinates | 44.88890, -115.95430 |
Physical Characteristics
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 75 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 188 acre-ft |
| Normal Storage | 188 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 48 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 07/16/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00241 |
| Federal ID | ID00241 |
| More Info | State Dam Safety Program |