Manor Lake Dam

Whippany River· Morris, New Jersey· Earth· 5 ft tall
Significant Hazard Local Government

Key Takeaway

Manor Lake Dam is classified as significant hazard in New Jersey. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 5 ft (taller than 0.1% in NJ)
Dam Length125 ft
Dam TypeEarth
Normal Storage9 acre-ft
Surface Area4 acres
Drainage Area2 sq mi
Max Discharge375 cfs
NID IDNJ01026

Safety Information

Significant Hazard

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: Yes
Last Inspection: September 21, 2022
State Regulated: Yes
Regulatory Agency: NJDEP

Ownership

Township of Parsippany-Troy Hills

Local Government

Nearby Dams

Intervale Lake Dam

Morris, NJ

Low Hazard 6 ft

Wildwood Lake Dam

Morris, NJ

High Hazard 13 ft

Wildwood Dike

Morris, NJ

Low Hazard 8 ft

Decozen'S Dam

Morris, NJ

Significant Hazard 11 ft

Mountain Lake Dam

Morris, NJ

High Hazard 15 ft

Parsippany Dike

Morris, NJ

High Hazard 30 ft

Sunset Lake Dam

Morris, NJ

High Hazard 8 ft

Crystal Lake Dam

Morris, NJ

High Hazard 16 ft

Frequently Asked Questions

What is the hazard classification of Manor Lake Dam?

Manor Lake Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Manor Lake Dam?

Manor Lake Dam is owned by Township of Parsippany-Troy Hills (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

How tall is Manor Lake Dam?

Manor Lake Dam has a dam height of 5 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.

When was Manor Lake Dam last inspected?

Manor Lake Dam was last inspected on September 21, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.