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Lake Isabelle Dam
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Lake Isabelle Dam Share
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Overview Share
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Longmont, Colorado
Privately owned
Built in 1925

Lake Isabelle Dam is a rockfill dam built on the S. F. St. Vrain Creek River and is located in Longmont, Colorado. It was built in 1925 .

The dam is privately owned by Left Hand Ditch Company. The dam used to be known as Audubon #3.

Location
Lake Isabelle Dam
Longmont, Colorado, U.S.
Dam type
Rockfill
Dam type
Other
Purpose
Unknown
Foundation type
Unknown
Core type
Ownership Share
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Left Hand Ditch Company
Owner
Private

Lake Isabelle Dam is privately owned by Left Hand Ditch Company.

Construction Share
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1925
Completed
S. F. St. Vrain Creek River
River built on
Lake Isabelle Dam was built in 1925.
Metrics Share
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Summary
Dam height 38 feet
Structural height 38 feet
Hydraulic height 38 feet
Max discharge 1,262 cubic feet per second
Max storage 738 acre feet
Normal storage 594 acre feet
Surface area 36 acres
Drainage area 2 square miles
38 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.

38 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.

38 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.

1,262 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.

738 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.

594 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.

36 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.

9/24/1990
Most recent inspection date

About Share
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Former name Audubon #3
Distance to nearest town (miles) 26
Latitude 40
Longitude -105
NID ID (National ID) CO01929

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