Hecla-day Mine Aspen Tailings Saddle Dam is an earth dam located in Ferry County, Washington, built in 1987. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 40 ft40 ft tall and 1,240 ft long, taller than 86% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Hecla-day Mine Aspen Tailings Saddle Dam
The primary purpose of Hecla-day Mine Aspen Tailings Saddle Dam is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Hecla Mining Co (private). It impounds the Tr-granite Creek near Republic.
The dam stands 40 feet tall and stretches 1,240 feet across, creates a reservoir covering 38 acres, has a maximum storage capacity of 625 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1987, the structure is 39 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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/19/2024.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | Washington |
| County | Ferry |
| Nearest City | Republic |
| River/Stream | Tr-granite Creek |
| Coordinates | 48.67594, -118.75883 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Length | 1,240 ft |
| Year Completed | 1987 (39 years old) |
Storage & Hydraulics
| NID Storage | 625 acre-ft |
| Max Storage | 625 acre-ft |
| Normal Storage | 365 acre-ft |
| Surface Area | 38 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 166 cfs |
Ownership & Safety
| Purpose | Tailings |
| Owner | Hecla Mining Co |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/19/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00631 |
| Federal ID | WA00631 |
| More Info | State Dam Safety Program |