Centralia Coal Mine Dam No 19a
Centralia Coal Mine Dam No 19a is an earth dam located in Lewis County, Washington, built in 1977. It carries a Low hazard potential classification.
About Centralia Coal Mine Dam No 19a
The primary purpose of Centralia Coal Mine Dam No 19a 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 Transalta Centralia Mining Llc (public utility). It impounds the Tr-packwood Creek near Centralia.
The dam stands 13 feet tall, creates a reservoir covering 10 acres, has a maximum storage capacity of 130 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1977, the structure is 49 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.
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Location
| State | Washington |
| County | Lewis |
| Nearest City | Centralia |
| River/Stream | Tr-packwood Creek |
| Coordinates | 46.73124, -122.79571 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 130 acre-ft |
| Max Storage | 130 acre-ft |
| Normal Storage | 105 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 54 cfs |
Ownership & Safety
| Purpose | Tailings |
| Owner | TransAlta Centralia Mining LLC |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00588 |
| Federal ID | WA00588 |
| More Info | State Dam Safety Program |