Centralia Coal Mine Dam No 32b is an earth dam located in Thurston County, Washington, built in 1991. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 27 ft27 ft tall, taller than 59% 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 Centralia Coal Mine Dam No 32b
The primary purpose of Centralia Coal Mine Dam No 32b is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Transalta Centralia Mining LLC (public utility). It impounds the North Hanaford Creek near Centralia.
The dam stands 27 feet tall, creates a reservoir covering 18 acres, has a maximum storage capacity of 440 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1991, the structure is 35 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. An emergency action plan is in place for this dam.
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Location
| State | Washington |
| County | Thurston |
| Nearest City | Centralia |
| River/Stream | North Hanaford Creek |
| Coordinates | 46.77572, -122.82396 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 440 acre-ft |
| Max Storage | 440 acre-ft |
| Normal Storage | 124 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 611 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Transalta Centralia Mining LLC |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00607 |
| Federal ID | WA00607 |
| More Info | State Dam Safety Program |