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Alder Dam
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Alder Dam Share
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Yelm, Washington
Public utility owned
Built in 1945

Alder Dam is built on the Nisqually River and is located in Yelm, Washington. It was built in 1945 .

The dam is owned by the public utility, City of Tacoma.

Location
Alder Dam
Yelm, Washington, U.S.
Dam type
Other
Dam type
Other
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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City of Tacoma
Owner
Public utility

Alder Dam is owned by the public utility, City of Tacoma.

Construction Share
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1945
Completed
Nisqually River
River built on
Alder Dam was built in 1945.
Metrics Share
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Summary
Dam length 1,487 feet
Dam height 285 feet
Structural height 330 feet
Hydraulic height 290 feet
Max discharge 80,000 cubic feet per second
Max storage 241,195 acre feet
Normal storage 214,500 acre feet
Surface area 3,065 acres
Drainage area 286 square miles
1,487 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.

285 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.

330 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.

290 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.

80,000 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.

241,195 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.

214,500 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.

3,065 acres
Surface area

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

286 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.

10/17/2017
Most recent inspection date

Inspections are every 1 ear.

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Distance to nearest town (miles) 18
Latitude 46
Longitude -122
NID ID (National ID) WA00257

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