Boulder Lake
Boulder Lake is a dam located in Valley County, Idaho, built in 1902. It carries a Significant hazard potential classification and has a fair condition assessment.
About Boulder Lake
The primary purpose of Boulder 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 Boulder Creek North Fork Payette River near Mccall.
The dam stands 15 feet tall and stretches 450 feet across, creates a reservoir covering 114 acres, has a storage capacity of 1,310 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1902, 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 07/16/2018.
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Location
| State | Idaho |
| County | Valley |
| Nearest City | Mccall |
| River/Stream | Boulder Creek North Fork Payette River |
| Coordinates | 44.86620, -115.93840 |
Physical Characteristics
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 450 ft |
| Year Completed | 1902 (124 years old) |
Storage & Hydraulics
| NID Storage | 1,310 acre-ft |
| Normal Storage | 1,310 acre-ft |
| Surface Area | 114 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 160 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 07/16/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00242 |
| Federal ID | ID00242 |
| More Info | State Dam Safety Program |