Longwood Lake Dam

Morris County, New Jersey (near Jefferson)

River/Stream: Rockaway River

High Hazard

Failure would likely cause loss of life

Key Facts

Dam Type
Stone
Height
22 ft
Dam Length
91 ft
Reservoir Storage
351 acre-ft
Year Completed
1898
Primary Purpose
Recreation
Owner Type
Local Government
Max Discharge
813 cfs

Condition Assessment

PoorLast inspected: 2024-03-21

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

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

Location

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Quick Stats

NID ID
NJ00333
State
New Jersey (NJ)
Coordinates
40.97790, -74.54662
Age
128 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.