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Trossachs Detention Pond PC-2 Dam
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Trossachs Detention Pond PC-2 Dam Share
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Carnation, Washington
Flood Control
Local government owned
Built in 2002

Trossachs Detention Pond PC-2 Dam is an earth dam built on the Patterson Creek - Offstream River and is located in Carnation, Washington. It was built in 2002 and modified in 2008O; for the purpose of flood control.

The dam is owned by the local government.

Location
Trossachs Detention Pond PC-2 Dam
Carnation, Washington, U.S.
Dam type
Earth
Dam type
Flood control
Purpose
Soil
Foundation type
Unknown
Core type
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City of Sammamish
Owner
Local government

Trossachs Detention Pond PC-2 Dam is owned by the local government.

Construction Share
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2002
Completed
2008O;
Modified
Hugh Goldsmith & Assoc.
Dam designer
Patterson Creek - Offstream River
River built on
Trossachs Detention Pond PC-2 Dam was built in 2002 and modified in 2008O;.
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Summary
Dam length 1,200 feet
Dam height 17 feet
Structural height 17 feet
Hydraulic height 17 feet
Max discharge 85 cubic feet per second
Max storage 55 acre feet
Normal storage 43 acre feet
Surface area 4 acres
Drainage area 0 square miles
1,200 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.

17 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.

17 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.

17 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.

85 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.

55 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.

43 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.

4 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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High
Downstream potential hazard

Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.

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.

6/13/2017
Most recent inspection date

Inspections are every 5 years.

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Distance to nearest town (miles) 7
Latitude 47
Longitude -121
NID ID (National ID) WA01833

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