Terrace Lake Dam

Pequannock River· Morris, New Jersey· Earth· 7 ft tall
Significant Hazard Recreation Private

Key Takeaway

Terrace Lake Dam is classified as significant hazard in New Jersey. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 7 ft (taller than 1.9% in NJ)
Dam Length737 ft
Dam TypeEarth
Max Storage21 acre-ft
Normal Storage11 acre-ft
Surface Area7 acres
Drainage Area0 sq mi
Max Discharge600 cfs
NID IDNJ00542

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: April 20, 2021
State Regulated: Yes
Regulatory Agency: NJDEP

Ownership

Cambridge Heights at Terrace Lake HOA

Private

Nearby Dams

Cold Spring Lake Dam

Passaic, NJ

Significant Hazard 16 ft

Henion Pond Dam

Passaic, NJ

Significant Hazard 10 ft

Kinnelon (Maple) Dam

Morris, NJ

Significant Hazard 14 ft

High Crest Lake Dam

Passaic, NJ

High Hazard 22 ft

Star Lake Upper Dam

Passaic, NJ

High Hazard 11 ft

Kampfe Lake Dam

Passaic, NJ

High Hazard 13 ft

Kakeout Dam

Morris, NJ

High Hazard 30 ft

Lake Arcadia Dam #2

Passaic, NJ

Significant Hazard 18 ft

Frequently Asked Questions

What is the hazard classification of Terrace Lake Dam?

Terrace 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 Terrace Lake Dam?

Terrace Lake Dam is owned by Cambridge Heights at Terrace Lake HOA (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Terrace Lake Dam?

Terrace Lake Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Terrace Lake Dam?

Terrace Lake Dam has a dam height of 7 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 Terrace Lake Dam last inspected?

Terrace Lake Dam was last inspected on April 20, 2021. 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.