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Thunder Basin NO 9 Dam
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Thunder Basin NO 9 Dam Share
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Overview Share
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Edgemont, Wyoming
Federal ownership
Built in 1937

Thunder Basin NO 9 Dam is an earth dam built on the Little Frog Creek River and is located in Edgemont, Wyoming. It was built in 1937 .

The dam is under federal ownership and is owned by the USDA FS. It is also known as 222W10. The dam used to be known as Little Frog Creek.

Location
Thunder Basin NO 9 Dam
Edgemont, Wyoming, U.S.
Dam type
Earth
Dam type
Other
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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USDA FS
Owner
Federal

Thunder Basin NO 9 Dam is under federal ownership and is owned by the USDA FS.

Construction Share
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1937
Completed
Little Frog Creek River
River built on
Thunder Basin NO 9 Dam was built in 1937.
Metrics Share
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Summary
Dam length 420 feet
Dam height 21 feet
Hydraulic height 17 feet
Max discharge 2 cubic feet per second
Max storage 53 acre feet
Normal storage 53 acre feet
Surface area 6 acres
Drainage area 2 square miles
420 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.

17 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.

2 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.

53 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.

53 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.

2 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.

5/26/2011
Most recent inspection date

Inspections are every 10 years.

About Share
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Also known as 222W10
Former name Little Frog Creek
Distance to nearest town (miles) 85
Latitude 43
Longitude -106
NID ID (National ID) WY01923

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