Centralia Coal Mine Dam No 3c South Reservoir Report
Last Updated: December 15, 2025
Centralia Coal Mine Dam No 3c South, also known as Widco Dam No.
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Summary
3c - South, is a significant earth dam located in Centralia, Washington. Completed in 1987, the dam serves as a tailings storage structure with a hydraulic height of 69 feet and a length of 1283 feet. It has a storage capacity of 9600 acre-feet, with a normal storage level of 6000 acre-feet, covering a surface area of 72 acres. The dam is situated on Tr-Packwood Creek-Offstream, under the regulatory oversight of the Washington Dept of Ecology.
The dam's hazard potential is classified as significant, but its condition assessment as of August 2020 was reported as satisfactory. Regular inspections are conducted every 5 years to ensure the dam's structural integrity and operational safety. Although no emergency action plan (EAP) information is provided, the dam meets state permitting and inspection requirements, indicating a commitment to proactive risk management and emergency preparedness. With its rock foundation and stone core design, Centralia Coal Mine Dam No 3c South plays a crucial role in managing tailings and protecting the surrounding environment in Lewis County, Washington.
In the event of an emergency, it is essential for stakeholders to be updated on the dam's risk assessment, management measures, and inundation maps. The dam's location within Congressional District 03, Washington, under the representation of Jaime Herrera Beutler, underscores the importance of effective communication and collaboration between local, state, and federal agencies. As water resource and climate enthusiasts, understanding the nuances of dam safety and regulatory compliance at Centralia Coal Mine Dam No 3c South is crucial for ensuring the long-term sustainability and resilience of water infrastructure in the region.
Year Completed |
1987 |
Dam Length |
1283 |
River Or Stream |
Tr-Packwood Creek-Offstream |
Primary Dam Type |
Earth |
Surface Area |
72 |
Hydraulic Height |
69 |
Drainage Area |
0.34 |
Nid Storage |
9600 |
Structural Height |
69 |
Hazard Potential |
Significant |
Foundations |
Rock |
Nid Height |
69 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Tenino City Park
|
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Stan Hedwall Park
|
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Millersylvania State Park
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Centralia Coal Mine Dam No 3c South