Centralia Coal Mine Dam No 8 Reservoir Report
Last Updated: December 15, 2025
Centralia Coal Mine Dam No 8, also known as Widco Dam No.
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Summary
8, is a crucial structure located in Centralia, Washington, along the Tr-South Hanaford Creek. This Earth-type dam, completed in 1972, serves primarily for tailings purposes and stands at a hydraulic height of 12 feet. With a storage capacity of 84 acre-feet, this dam plays a significant role in managing water resources in the area.
Managed by the Washington Dept of Ecology, Centralia Coal Mine Dam No 8 is regulated and inspected regularly to ensure its structural integrity and safety. Despite being classified as having a significant hazard potential, its condition is currently not rated. Emergency action plans are in place, with the latest revision dating back to March 2022, to address any potential risks and ensure the safety of the surrounding community in case of emergencies.
With its strategic location and vital function in water management, Centralia Coal Mine Dam No 8 stands as a key asset in the region's infrastructure. Climate and water resource enthusiasts alike can appreciate the importance of this dam in safeguarding the environment and supporting sustainable development in Centralia, Washington.
Year Completed |
1972 |
River Or Stream |
Tr-South Hanaford Creek |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
12 |
Drainage Area |
2.49 |
Nid Storage |
84 |
Structural Height |
12 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
12 |
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.
Centralia Coal Mine Dam No 8