Iona Lake Dam

Still Run· Gloucester, New Jersey· Earth· 11 ft tall
Significant Hazard Recreation Local Government

Key Takeaway

Iona 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 11 ft (taller than 25.9% in NJ)
Dam Length800 ft
Dam TypeEarth
Normal Storage108 acre-ft
Surface Area60 acres
Drainage Area26 sq mi
Max Discharge1,248 cfs
NID IDNJ00030

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: March 23, 2021
State Regulated: Yes
Regulatory Agency: NJDEP

Ownership

Township of Franklin

Local Government

Nearby Dams

Village Dock Lake Dam

Gloucester, NJ

Low Hazard 7 ft

Franklinville Lake Dam

Gloucester, NJ

High Hazard 8 ft

Malaga Dam

Gloucester, NJ

Significant Hazard 22 ft

Willow Grove Dam

Salem, NJ

Significant Hazard 10 ft

Lake Garrison Dam

Gloucester, NJ

Significant Hazard 7 ft

Silver Lake Dam

Gloucester, NJ

Significant Hazard 6 ft

Wilson Lake Dam

Gloucester, NJ

Significant Hazard 6 ft

Burnt Mill Pond Dam

Cumberland, NJ

Significant Hazard 9 ft

Frequently Asked Questions

What is the hazard classification of Iona Lake Dam?

Iona 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 Iona Lake Dam?

Iona Lake Dam is owned by Township of Franklin (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Iona Lake Dam?

Iona 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 Iona Lake Dam?

Iona Lake Dam has a dam height of 11 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 Iona Lake Dam last inspected?

Iona Lake Dam was last inspected on March 23, 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.