Hornet Creek Upper South is a dam located in Washington County, Idaho, built in 1913. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 19 ft19 ft tall and 400 ft long. 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 Hornet Creek Upper South
The primary purpose of Hornet Creek Upper South 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 Hornet Creek Weiser River.
The dam stands 19 feet tall and stretches 400 feet across, creates a reservoir covering 32 acres, has a storage capacity of 265 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1913, 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 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 08/18/2017.
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Location
| State | Idaho |
| County | Washington |
| River/Stream | Hornet Creek Weiser River |
| Coordinates | 44.79625, -116.73166 |
Physical Characteristics
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 400 ft |
| Year Completed | 1913 (113 years old) |
Storage & Hydraulics
| NID Storage | 265 acre-ft |
| Normal Storage | 265 acre-ft |
| Surface Area | 32 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 67 cfs |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/18/2017 |
| Emergency Action Plan | No |
Identifiers
| NID ID | ID00523 |
| Federal ID | ID00523 |
| More Info | State Dam Safety Program |