Lake Shawnee Dam

Weldon Brook· Morris, New Jersey· Earth· 9 ft tall
Significant Hazard Recreation Private

Key Takeaway

Lake Shawnee 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 9 ft (taller than 12.9% in NJ)
Dam Length150 ft
Dam TypeEarth
Max Storage376 acre-ft
Normal Storage184 acre-ft
Surface Area79 acres
Drainage Area8 sq mi
Max Discharge522 cfs
NID IDNJ00334

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: January 18, 2021
State Regulated: Yes
Regulatory Agency: NJDEP

Ownership

Lake Shawnee Club

Private

Nearby Dams

Lake Winona Dam

Morris, NJ

High Hazard 15 ft

Saffin Pond Dam

Morris, NJ

Significant Hazard 24 ft

Picatinny Lake

Morris, NJ

High Hazard 15 ft

Blue Heron Lake Dam

Sussex, NJ

Low Hazard 7 ft

Laidlaws Pond Dam

Sussex, NJ

Low Hazard 20 ft

Longwood Lake Dam

Morris, NJ

High Hazard 22 ft

Seneca Lake Dam

Sussex, NJ

Significant Hazard 11 ft

Tomahawk Lake Dam

Sussex, NJ

Low Hazard 14 ft

Frequently Asked Questions

What is the hazard classification of Lake Shawnee Dam?

Lake Shawnee 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 Lake Shawnee Dam?

Lake Shawnee Dam is owned by Lake Shawnee Club (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Lake Shawnee Dam?

Lake Shawnee 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 Lake Shawnee Dam?

Lake Shawnee Dam has a dam height of 9 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 Lake Shawnee Dam last inspected?

Lake Shawnee Dam was last inspected on January 18, 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.