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Timothy Lake Dam
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Timothy Lake Dam Share
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Estacada, Oregon
Privately owned
Built in 1956

Timothy Lake Dam is an earth dam built on the Oak Grove River and is located in Estacada, Oregon. It was built in 1956 and modified in 1992 .

The dam is privately owned by Portland General Electric Company. It is also known as Timothy Lake (Res).

Location
Timothy Lake Dam
Estacada, Oregon, U.S.
Dam type
Earth
Dam type
Other
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Portland General Electric Company
Owner
Private

Timothy Lake Dam is privately owned by Portland General Electric Company.

Construction Share
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1956
Completed
1992
Modified
Oak Grove River
River built on
Timothy Lake Dam was built in 1956 and modified in 1992.
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Summary
Dam length 740 feet
Dam height 100 feet
Structural height 100 feet
Hydraulic height 92 feet
Max discharge 16,000 cubic feet per second
Max storage 69,000 acre feet
Normal storage 66,000 acre feet
Surface area 1,430 acres
Drainage area 54 square miles
740 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.

100 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.

100 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.

92 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.

16,000 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.

69,000 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.

66,000 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.

1,430 acres
Surface area

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

54 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.

9/20/2017
Most recent inspection date

Inspections are every 1 ear.

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Also known as Timothy Lake (Res)
Distance to nearest town (miles) 44
Latitude 45
Longitude -121
NID ID (National ID) OR00545

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