Centralia Coal Mine Pond 46 Dam Reservoir Report
Last Updated: December 15, 2025
Centralia Coal Mine Pond 46 Dam, located in Lewis County, Washington, was completed in 2004 with a primary purpose of flood risk reduction along the Mitchell Creek.
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Summary
This earth dam stands at a hydraulic height of 30 feet and a structural height of 10 feet, with a length of 190 feet and a storage capacity of 16 acre-feet. The dam, owned by a public utility, is regulated by the Washington Department of Ecology and undergoes regular inspections to ensure its fair condition.
With a surface area of 4.8 acres and a drainage area of 0.1 square miles, Centralia Coal Mine Pond 46 Dam plays a crucial role in mitigating the risk of flooding in the surrounding area. The dam's spillway type, outlet gates, and specific hazard potential are not explicitly mentioned in the data, but its significant hazard potential underscores the importance of its maintenance and emergency preparedness. While the dam's condition was assessed as fair in 2020, it is essential to continue monitoring and implementing risk management measures to ensure its long-term effectiveness in flood risk reduction.
Congressional District 03's representative, Jaime Herrera Beutler, oversees the area where the dam is located and plays a crucial role in advocating for the proper maintenance and funding of critical infrastructure like Centralia Coal Mine Pond 46 Dam. The dam's emergency action plan (EAP) status, inundation maps, and risk assessment details were not provided in the data, highlighting the need for ongoing evaluation and proactive measures to address any potential risks associated with the dam. As water resource and climate enthusiasts, staying informed and engaged in the upkeep of essential infrastructure like Centralia Coal Mine Pond 46 Dam is vital for safeguarding communities and the environment from the impacts of extreme weather events.
Year Completed |
2004 |
Dam Length |
190 |
River Or Stream |
Tr - Mitchell Creek |
Primary Dam Type |
Earth |
Surface Area |
4.8 |
Hydraulic Height |
30 |
Drainage Area |
0.1 |
Nid Storage |
16 |
Structural Height |
10 |
Hazard Potential |
Significant |
Foundations |
Rock, Soil |
Nid Height |
30 |
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 Pond 46 Dam