Koskella is a dam located in Valley County, Idaho, built in 1947. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 24 ft24 ft tall and 310 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 Koskella
The primary purpose of Koskella 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 North Fork Payette River.
The dam stands 24 feet tall and stretches 310 feet across, creates a reservoir covering 12 acres, has a storage capacity of 74 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1947, 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 11/03/2016.
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Location
| State | Idaho |
| County | Valley |
| River/Stream | Unnamed Stream North Fork Payette River |
| Coordinates | 44.66900, -116.02470 |
Physical Characteristics
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 310 ft |
| Year Completed | 1947 (79 years old) |
Storage & Hydraulics
| NID Storage | 74 acre-ft |
| Normal Storage | 74 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 55 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 11/03/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00119 |
| Federal ID | ID00119 |
| More Info | State Dam Safety Program |