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Siena Dam
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Siena Dam Share
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Lafayette, Colorado
Water Supply
Local government owned
Built in 2004

Siena Dam is an earth dam built on the Coal Creek-Tr River and is located in Lafayette, Colorado. It was built in 2004 for the purpose of water supply.

The dam is owned by the local government.

Location
Siena Dam
Lafayette, Colorado, U.S.
Dam type
Earth
Dam type
Water supply
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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City of Broomfield
Owner
Local government

Siena Dam is owned by the local government.

Construction Share
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2004
Completed
Basepoint Design Corporation
Dam designer
Coal Creek-Tr River
River built on
Siena Dam was built in 2004.
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Summary
Dam length 1,250 feet
Dam height 40 feet
Structural height 41 feet
Hydraulic height 31 feet
Max discharge 690 cubic feet per second
Max storage 640 acre feet
Normal storage 450 acre feet
Surface area 20 acres
1,250 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.

40 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.

41 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.

690 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.

640 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.

450 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.

20 acres
Surface area

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

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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.

6/21/2017
Most recent inspection date

Inspections are every 1 ear.

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Distance to nearest town (miles) 2
Latitude 39
Longitude -105
NID ID (National ID) CO02859

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