Arrowhead Reservoir
Arrowhead Reservoir is a dam located in Lemhi County, Idaho, built in 1975. It carries a Significant hazard potential classification and has a fair condition assessment.
About Arrowhead Reservoir
The primary purpose of Arrowhead Reservoir 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 Chipps Creek Pollard Canyon Creek near Salmon.
The dam stands 20 feet tall, creates a reservoir covering 2 acres, has a storage capacity of 16 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1975, 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 08/21/2020.
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Location
| State | Idaho |
| County | Lemhi |
| Nearest City | Salmon |
| River/Stream | Chipps Creek Pollard Canyon Creek |
| Coordinates | 45.17270, -113.94050 |
Physical Characteristics
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 16 acre-ft |
| Normal Storage | 16 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 37 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/21/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00718 |
| Federal ID | ID00718 |
| More Info | State Dam Safety Program |