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Porter CC Reservoir (Clackamas) Dam
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Porter CC Reservoir (Clackamas) Dam Share
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Overview Share
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Four Corners, Oregon
Recreation
Privately owned
Built in 1977

Porter CC Reservoir (Clackamas) Dam is an earth dam built on the Unnamed River and is located in Four Corners, Oregon. It was built in 1977 for the purpose of recreation.

The dam is privately owned by Dan Myrick. It is also known as Porter Main Dam (East). The dam used to be known as Big Rock Lake.

Location
Porter CC Reservoir (Clackamas) Dam
Four Corners, Oregon, U.S.
Dam type
Earth
Dam type
Recreation
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Dan Myrick
Owner
Private

Porter CC Reservoir (Clackamas) Dam is privately owned by Dan Myrick.

Construction Share
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1977
Completed
Unnamed River
River built on
Porter CC Reservoir (Clackamas) Dam was built in 1977.
Metrics Share
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Summary
Dam length 500 feet
Dam height 21 feet
Structural height 26 feet
Hydraulic height 18 feet
Max discharge 12 cubic feet per second
Max storage 80 acre feet
Normal storage 57 acre feet
Surface area 6 acres
Drainage area 0 square miles
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.

21 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.

26 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.

18 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.

12 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.

80 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.

57 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.

6 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.

Safety Share
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Low
Downstream potential hazard

Dams assigned the low hazard potential classification are those where failure or misoperation results in no probable loss of human life and low economic and/or environ-mental losses. Losses are principally limited to the owner’s property.

Not required
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.

11/17/2011
Most recent inspection date

Inspections are every 6 years.

About Share
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Also known as Porter Main Dam (East)
Former name Big Rock Lake
Distance to nearest town (miles) 3
Latitude 45
Longitude -122
NID ID (National ID) OR00644

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