Willow Grove Dam

Maurice River· Salem, New Jersey· Earth· 10 ft tall
Significant Hazard Other Private

Key Takeaway

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

Physical Details

Dam Height 10 ft (taller than 17.8% in NJ)
Dam Length1,500 ft
Dam TypeEarth
Normal Storage512 acre-ft
Surface Area125 acres
Drainage Area65 sq mi
Max Discharge2,160 cfs
NID IDNJ00040

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 8, 2022
State Regulated: Yes
Regulatory Agency: NJDEP

Ownership

The Nature Conservancy

Private

Nearby Dams

Malaga Dam

Gloucester, NJ

Significant Hazard 22 ft

Burnt Mill Pond Dam

Cumberland, NJ

Significant Hazard 9 ft

Iona Lake Dam

Gloucester, NJ

Significant Hazard 11 ft

Village Dock Lake Dam

Gloucester, NJ

Low Hazard 7 ft

Franklinville Lake Dam

Gloucester, NJ

High Hazard 8 ft

Parvin Lake Dam

Salem, NJ

Significant Hazard 12 ft

Rainbow Lake Dam

Salem, NJ

Significant Hazard 20 ft

Thundergust Pond Dam

Salem, NJ

Significant Hazard 13 ft

Frequently Asked Questions

What is the hazard classification of Willow Grove Dam?

Willow Grove 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 Willow Grove Dam?

Willow Grove Dam is owned by The Nature Conservancy (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Willow Grove Dam?

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

How tall is Willow Grove Dam?

Willow Grove Dam has a dam height of 10 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 Willow Grove Dam last inspected?

Willow Grove Dam was last inspected on April 8, 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.