Big Dam is a gravity dam built on the Big Lake Offstream Trib River and is located in Oregon. It was built in 1966 for the purpose of water supply.
The dam is under federal ownership and is owned by the Doi BLM.
Big Dam is under federal ownership and is owned by the Doi BLM.
|Dam height||13 feet|
|Structural height||13 feet|
|Hydraulic height||12 feet|
|Normal storage||674 acre feet|
|Surface area||46 acres|
|Drainage area||1 square miles|
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.
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.
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.
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.
Surface area, in acres, of the impoundment at its normal retention level.
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.
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 ownerâs property.
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.
Inspections are every 5 years.
|NID ID (National ID)||OR00757|