Assunpink #8 Dam

Pond Run· Mercer, New Jersey· Earth· 20 ft tall

High Hazard Water Supply Local Government

Key Takeaway

Assunpink #8 Dam is classified as high hazard in New Jersey. Its primary use is water supply. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.

Physical Details

Dam Height	20 ft (taller than 72.4% in NJ)
Dam Length	1,450 ft
Dam Type	Earth
Normal Storage	26 acre-ft

Surface Area	13 acres
Drainage Area	3 sq mi
Max Discharge	0 cfs
NID ID	NJ00543

Safety Information

High Hazard

Loss of human life is likely if the dam fails.

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

Emergency Action Plan: Yes

Last Inspection: May 7, 2021

State Regulated: Yes

Regulatory Agency: NJDEP

Ownership

Hamilton Township

Local Government

Nearby Dams

Gropps Lake Dam

Mercer, NJ

Low Hazard 25 ft

Assunpink #21 Dam

Mercer, NJ

High Hazard 25 ft

Assunpink #20 Dam

Mercer, NJ

High Hazard 26 ft

Colonial Lake Dam

Mercer, NJ

Low Hazard 12 ft

Indian Dam

Monmouth, NJ

Significant Hazard 17 ft

Assunpink # 6 Dam

Mercer, NJ

High Hazard 31 ft

Allentown Dam

Monmouth, NJ

High Hazard 18 ft

Matrix Detention Basin

Mercer, NJ

Low Hazard 8 ft

Frequently Asked Questions

What is the hazard classification of Assunpink #8 Dam?

Assunpink #8 Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Assunpink #8 Dam?

Assunpink #8 Dam is owned by Hamilton Township (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Assunpink #8 Dam?

Assunpink #8 Dam serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Assunpink #8 Dam?

Assunpink #8 Dam has a dam height of 20 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 Assunpink #8 Dam last inspected?

Assunpink #8 Dam was last inspected on May 7, 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.