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Centralia Coal Mine Dam No. 3B
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Centralia Coal Mine Dam No. 3B Share
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Centralia, Washington
Tailings
Public utility owned
Built in 1980

Centralia Coal Mine Dam No. 3B is an earth dam built on the Tr-Hanaford Creek River and is located in Centralia, Washington. It was built in 1980 and modified in 1993O; for the purpose of tailings.

The dam is owned by the public utility, Transalta Centralia Mining LLC. It is also known as Widco Dam No. 3B.

Location
Centralia Coal Mine Dam No. 3B
Centralia, Washington, U.S.
Dam type
Earth
Dam type
Tailings
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Transalta Centralia Mining LLC
Owner
Public utility

Centralia Coal Mine Dam No. 3B is owned by the public utility, Transalta Centralia Mining LLC.

Construction Share
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1980
Completed
1993O;
Modified
WA Irr. & Devel. Co.
Dam designer
Tr-Hanaford Creek River
River built on
Centralia Coal Mine Dam No. 3B was built in 1980 and modified in 1993O;.
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Summary
Dam length 1,700 feet
Dam height 140 feet
Structural height 140 feet
Hydraulic height 140 feet
Max discharge 99 cubic feet per second
Max storage 7,750 acre feet
Normal storage 5,500 acre feet
Surface area 115 acres
Drainage area 0 square miles
1,700 feet
Dam length

Length of the dam is defined as the length along the top of the dam. This also includes the spillway, powerplant, navigation lock, fish pass, etc., where these form part of the length of the dam. If detached from the dam, these structures should not be included.

140 feet
Dam height

Height of the dam is defined as the vertical distance between the lowest point on the crest of the dam and the lowest point in the original streambed.

140 feet
Structural height

Structural height of the dam is defined as the vertical distance from the lowest point of the excavated foundation to the top of the dam. Top of dam refers to the parapet wall and not the crest.

140 feet
Hydraulic height

Hydraulic height of the dam is defined as the vertical difference between the maximum design water level and the lowest point in the original streambed.

99 cubic feet per second
Max discharge

Number of cubic feet per second the spillway is capable of discharging when the reservoir is at its maximum designed water surface elevation.

7,750 acre feet
Max storage

Maximum storage is defined as the total storage space in a reservoir below the maximum attainable water surface elevation, including any surcharge storage.

5,500 acre feet
Normal storage

Normal storage is defined as the total storage space in a reservoir below the normal retention level, including dead and inactive storage and excluding any flood control or surcharge storage. For normally dry flood control dams, the normal storage will be a zero value.

115 acres
Surface area

Surface area, in acres, of the impoundment at its normal retention level.

0 square miles
Drainage area

Drainage area of the dam, in square miles, which is defined as the area that drains to a particular point (in this case, the dam) on a river or stream.

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Significant
Downstream potential hazard

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 located in areas with population and significant infrastructure.

Has emergency action plan
Emergency action plan

An emergency action plan is defined as a plan of action to be taken to reduce the potential for property damage and loss of life in an area affected by a dam failure or large flood.

6/16/2016
Most recent inspection date

Inspections are every 5 years.

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Also known as Widco Dam No. 3B
Distance to nearest town (miles) 8
Latitude 46
Longitude -122
NID ID (National ID) WA00434

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