Centralia Power Plant Surge Pond Dam
Centralia Power Plant Surge Pond Dam is an earth dam located in Lewis County, Washington, built in 1971. It carries a Low hazard potential classification.
About Centralia Power Plant Surge Pond Dam
The primary purpose of Centralia Power Plant Surge Pond Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Transalta Centralia Mining Llc (public utility). It impounds the Hanaford Creek near Centralia.
The dam stands 13 feet tall, creates a reservoir covering 33 acres, has a maximum storage capacity of 174 acre-feet, and collects water from a drainage area of 15 square miles. Completed in 1971, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 09/01/2011. That was over 14 years ago.
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Location
| State | Washington |
| County | Lewis |
| Nearest City | Centralia |
| River/Stream | Hanaford Creek |
| Coordinates | 46.75779, -122.86364 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 13 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 174 acre-ft |
| Max Storage | 174 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 33 acres |
| Drainage Area | 15 sq mi |
| Max Discharge | 41 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | TransAlta Centralia Mining LLC |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Last Inspection | 09/01/2011 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00134 |
| Federal ID | WA00134 |
| More Info | State Dam Safety Program |