Centralia Coal Mine Dam No 20c dam
Centralia Coal Mine Dam No 20c
Centralia Coal Mine Dam No 20c, also known as Widco Dam No. 20c, is a public utility structure located in Centralia, Washington. Constructed in 1981, the dam serves primarily as a tailings storage facility for the Centralia Coal Mine. With a maximum storage capacity of 60 acre-feet and a normal storage of 50 acre-feet, the dam is designed as an earth structure with a stone core and soil foundation.
Situated on Tr-Hanaford Creek in Thurston County, Washington, the Centralia Coal Mine Dam No 20c has a hydraulic height of 10 feet and a structural height of 9 feet. The dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Although the dam is state regulated by the Washington Department of Ecology, it has not been inspected or assessed for risk management measures. Despite its low hazard potential, the dam's emergency action plan and inundation maps have not been prepared or updated.
Overall, Centralia Coal Mine Dam No 20c is a vital infrastructure serving the tailings storage needs of the Centralia Coal Mine. With its location on Tr-Hanaford Creek and its state-regulated status, the dam plays a crucial role in water resource management and environmental protection in the region. However, there is a need for further inspection, risk assessment, and emergency preparedness to ensure the safety and stability of the dam in the face of potential climate-related challenges.
Dam data reference
Condition Assessment
- Satisfactory
- No 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.
- 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.
- 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.
Hazard Potential Classification
- High
- Dams 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, environmental 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.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Centralia Coal Mine Dam No 20c -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Skookumchuck River Near Bucoda | 150 cfs | → |
| Skookumchuck River Bl Bldy Run Cr Nr Centralia | 118 cfs | → |
| Chehalis River Near Grand Mound | 792 cfs | → |
| Nf Newaukum River Above Bear Creek Near Forest | 73 cfs | → |
| Deschutes River Near Rainier | 91 cfs | → |
| Newaukum River Near Chehalis | 233 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Centralia Coal Mine Dam No 20c.
Boat launches
- Skookumchuck Road Southeast Thurston County
- Boat Launch Road Thurston County
- Willapa Hills Trail Lewis County
- Henslin Drive Southeast 5725, Olympia
- Spanaway Mckenna Highway Pierce County
- Elma Gate Road West Grays Harbor County
Campgrounds
- Tenino City Park
- Millersylvania State Park
- Stan Hedwall Park
- Millersylvania State Park Campground
- American Heritage Campground
- Margaret Mckenny Campground
Paddle runs
- Headwaters In Sw1/4 Sec 28, T9n, R5e To Mount St. Helens National Volcanic Monument Boundary
- Mount St. Helens National Volcanic Monument Boundary To Mount St. Helens National Volcanic Boundary In Sw 1/4 Of Sec 32, T11n, R5e
- Goat Rocks Wilderness Bounday To Cowlitz Falls Ferc Project Boundary In Ne1/4 Of Nw1/4 Of Sec 4, T11n, R6e
- Mount St. Helens National Volcanic Monument Boundary To To Point River Reenters Mshnvm In Se 1/4 Of Sec 11, T10n, R5e
- Headwaters In Se1/4 Of Sec 31, T10n, R6e To Mount St. Helens National Volcanic Monument Boundary
- Confluence With Ipsut Creek To Western Boundary Of Mount Rainier National Park
Track Centralia Coal Mine Dam No 20c in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Centralia Coal Mine Dam No 20c
Where does the data for Centralia Coal Mine Dam No 20c come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Low hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Centralia Coal Mine Dam No 20c.