Cinnabar
Cinnabar is a dam located in Washington County, Idaho, built in 1975. It carries a Low hazard potential classification and has a fair condition assessment.
About Cinnabar
The primary purpose of Cinnabar 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 Streams Cove Creek near Weiser.
The dam stands 26 feet tall and stretches 480 feet across, creates a reservoir covering 22 acres, has a storage capacity of 173 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 05/07/2020.
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Location
| State | Idaho |
| County | Washington |
| Nearest City | Weiser |
| River/Stream | Unnamed Streams Cove Creek |
| Coordinates | 44.25490, -116.66840 |
Physical Characteristics
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 480 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 173 acre-ft |
| Normal Storage | 173 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 274 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/07/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ID00421 |
| Federal ID | ID00421 |
| More Info | State Dam Safety Program |