Centralia Coal Mine Dam No 36a
Centralia Coal Mine Dam No 36a is an earth dam located in Lewis County, Washington, built in 1989. It carries a Low hazard potential classification.
About Centralia Coal Mine Dam No 36a
The primary purpose of Centralia Coal Mine Dam No 36a 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 Hanaford Creek-offstream near Centralia.
The dam stands 14 feet tall, creates a reservoir covering 18 acres, has a maximum storage capacity of 90 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1989, the structure is 37 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 | Hanaford Creek-offstream |
| Coordinates | 46.75494, -122.82982 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 90 acre-ft |
| Max Storage | 90 acre-ft |
| Normal Storage | 56 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 120 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 | WA00573 |
| Federal ID | WA00573 |
| More Info | State Dam Safety Program |