Granite Lake
Granite Lake is a dam located in Valley County, Idaho, built in 1949. It carries a Significant hazard potential classification and has a fair condition assessment.
About Granite Lake
The primary purpose of Granite 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 Lake Creek East Fork Fisher Creek near Mccall.
The dam stands 25 feet tall and stretches 1,460 feet across, creates a reservoir covering 195 acres, has a storage capacity of 2,900 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1949, the structure is well-established, with more than 75 years of service.
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 07/03/2018.
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Location
| State | Idaho |
| County | Valley |
| Nearest City | Mccall |
| River/Stream | Lake Creek East Fork Fisher Creek |
| Coordinates | 45.10030, -116.08180 |
Physical Characteristics
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 1,460 ft |
| Year Completed | 1949 (77 years old) |
Storage & Hydraulics
| NID Storage | 2,900 acre-ft |
| Normal Storage | 2,900 acre-ft |
| Surface Area | 195 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 73 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 07/03/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00245 |
| Federal ID | ID00245 |
| More Info | State Dam Safety Program |