Spencer
Spencer is a dam located in Idaho County, Idaho, built in 1954. It carries a Significant hazard potential classification and has a fair condition assessment.
About Spencer
The primary purpose of Spencer 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 Threemile Creek near Grangeville.
The dam stands 15 feet tall and stretches 650 feet across, creates a reservoir covering 4 acres, has a storage capacity of 25 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1954, 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 05/21/2018.
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Location
| State | Idaho |
| County | Idaho |
| Nearest City | Grangeville |
| River/Stream | Unnamed Stream Threemile Creek |
| Coordinates | 45.91580, -116.11430 |
Physical Characteristics
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 650 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 25 acre-ft |
| Normal Storage | 25 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 3 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/21/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00624 |
| Federal ID | ID00624 |
| More Info | State Dam Safety Program |