Upper Long Lake

Jefferson County, Colorado (near ARVADA)

River/Stream: RALSTON CREEK-OS

High Hazard

Failure would likely cause loss of life

Key Facts

Dam Type
Earth
Height
46 ft
Dam Length
1,500 ft
Reservoir Storage
1,770 acre-ft
Year Completed
1939
Primary Purpose
Water Supply
Owner Type
Public Utility
Max Discharge
8 cfs

Condition Assessment

UnsatisfactoryLast inspected: 2022-06-08

Hazard Classification: High — This describes the potential consequences of dam failure, not the likelihood of failure.

Condition Assessment: Unsatisfactory — This describes the current physical condition of the dam based on the most recent inspection.

Location

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Quick Stats

NID ID
CO01783
State
Colorado (CO)
Coordinates
39.82285, -105.23565
Age
87 years

Nearby Dams

External Resources

Data sourced from the National Inventory of Dams (NID). Information may not reflect the most current status of this dam. Hazard classification reflects potential consequences of failure, not the likelihood of failure or the current condition.