Hailesboro #4 Plant Dam

OSWEGATCHIE RIVER· St. Lawrence, New York· Built 1912· Concrete· 12 ft tall
Significant Hazard Hydroelectric Private

Key Takeaway

Hailesboro #4 Plant Dam is classified as significant hazard in New York. It was completed in 1912 and is 114 years old. Its primary use is hydroelectric. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 12 ft (taller than 23.2% in NY)
Dam Length95 ft
Dam TypeConcrete
Max Storage28 acre-ft
Normal Storage20 acre-ft
Surface Area2 acres
Drainage Area680 sq mi
Year Completed1912 (114 years old)
NID IDNY12194

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: June 15, 1995
State Regulated: No

Ownership

HYDRO DEVELOPMENT GROUP INCORPORATED

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Hailesboro #4 Plant Dam?

Hailesboro #4 Plant 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 Hailesboro #4 Plant Dam?

Hailesboro #4 Plant Dam is owned by HYDRO DEVELOPMENT GROUP INCORPORATED (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Hailesboro #4 Plant Dam built?

Hailesboro #4 Plant Dam was completed in 1912, making it 114 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Hailesboro #4 Plant Dam?

Hailesboro #4 Plant Dam serves the following purposes: Hydroelectric. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Hailesboro #4 Plant Dam?

Hailesboro #4 Plant Dam has a dam height of 12 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 Hailesboro #4 Plant Dam last inspected?

Hailesboro #4 Plant Dam was last inspected on June 15, 1995. 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.