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Port of Seattle - Lagoon #3 Expansion Dam
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Port of Seattle - Lagoon #3 Expansion Dam Share
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Overview Share
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Washington
Flood Control
Local government owned
Built in 2001

Port of Seattle - Lagoon #3 Expansion Dam is an earth dam built on the Des Moines Creek - Offstream River and is located in Washington. It was built in 2001 for the purpose of flood control.

The dam is owned by the local government.

Location
Port of Seattle - Lagoon #3 Expansion Dam
Washington, U.S.
Dam type
Earth
Dam type
Flood control
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Port of Seattle
Owner
Local government

Port of Seattle - Lagoon #3 Expansion Dam is owned by the local government.

Construction Share
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2001
Completed
Kennedy-Jenks Consultants
Dam designer
Des Moines Creek - Offstream River
River built on
Port of Seattle - Lagoon #3 Expansion Dam was built in 2001.
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Summary
Dam length 1,500 feet
Dam height 32 feet
Structural height 32 feet
Hydraulic height 32 feet
Max discharge 140 cubic feet per second
Max storage 256 acre feet
Normal storage 221 acre feet
Surface area 1 acres
1,500 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.

32 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.

32 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.

32 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.

140 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.

256 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.

221 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.

1 acres
Surface area

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

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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.

5/2/2017
Most recent inspection date

Inspections are every 5 years.

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Latitude 47
Longitude -122
NID ID (National ID) WA00671

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