Blackhawk Lake
Blackhawk Lake is a dam located in Valley County, Idaho, built in 1968. It carries a Significant hazard potential classification and has a fair condition assessment.
About Blackhawk Lake
The primary purpose of Blackhawk Lake 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 Duffner Creek North Fork Payette River near Payette River.
The dam stands 45 feet tall and stretches 490 feet across, creates a reservoir covering 95 acres, has a storage capacity of 1,630 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 05/08/2017.
At 45 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Idaho |
| County | Valley |
| Nearest City | Payette River |
| River/Stream | Duffner Creek North Fork Payette River |
| Coordinates | 44.84130, -116.17290 |
Physical Characteristics
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 490 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 1,630 acre-ft |
| Normal Storage | 1,630 acre-ft |
| Surface Area | 95 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 178 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/08/2017 |
| Emergency Action Plan | No |
Identifiers
| NID ID | ID00131 |
| Federal ID | ID00131 |
| More Info | State Dam Safety Program |