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Thomas Dam
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Carbondale, Colorado
Privately owned
Built in 1938

Thomas Dam is an earth dam built on the Thomas Creek-Os River and is located in Carbondale, Colorado. It was built in 1938 and modified in 1999SFH .

The dam is privately owned by Ranch Lake. It is also known as Lewis Lake, J. L. Thomas Reservoir.

Location
Thomas Dam
Carbondale, Colorado, U.S.
Dam type
Earth
Dam type
Other
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Ranch Lake
Owner
Private

Thomas Dam is privately owned by Ranch Lake.

Construction Share
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1938
Completed
1999SFH
Modified
Alonzo H. Adams; Colorado Engineering
Dam designer
Thomas Creek-Os River
River built on
Thomas Dam was built in 1938 and modified in 1999SFH.
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Summary
Dam length 100 feet
Dam height 32 feet
Structural height 32 feet
Hydraulic height 31 feet
Max discharge 800 cubic feet per second
Max storage 292 acre feet
Normal storage 172 acre feet
Surface area 15 acres
100 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.

32 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.

32 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.

31 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.

800 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.

292 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.

172 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.

15 acres
Surface area

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

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Significant
Downstream potential hazard

Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be located in areas with population and significant infrastructure.

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.

11/8/2016
Most recent inspection date

Inspections are every 2 years.

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Also known as Lewis Lake, J. L. Thomas Reservoir
Distance to nearest town (miles) 3
Latitude 39
Longitude -107
NID ID (National ID) CO01402

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