North Lake A Dam (Spillway)

NORTH LAKE OUTLET· Herkimer, New York· Built 1850· Earth· 15 ft tall
Low Hazard Navigation State Government

Key Takeaway

North Lake A Dam (Spillway) is classified as low hazard in New York. It was completed in 1850 and is 176 years old. Its primary use is navigation.

Physical Details

Dam Height 15 ft (taller than 37.1% in NY)
Dam Length160 ft
Dam TypeEarth
Max Storage2.2K acre-ft
Normal Storage1.5K acre-ft
Surface Area442 acres
Drainage Area31 sq mi
Year Completed1850 (176 years old)
NID IDNY00325

Safety Information

Low Hazard

No probable loss of human life and low economic/environmental losses expected.

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

Emergency Action Plan: No
Last Inspection: October 27, 1995
State Regulated: Yes
Regulatory Agency: NYS DEC

Ownership

New York State Canal Corporation

State Government

Nearby Dams

Frequently Asked Questions

What is the hazard classification of North Lake A Dam (Spillway)?

North Lake A Dam (Spillway) is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates North Lake A Dam (Spillway)?

North Lake A Dam (Spillway) is owned by New York State Canal Corporation (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was North Lake A Dam (Spillway) built?

North Lake A Dam (Spillway) was completed in 1850, making it 176 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 North Lake A Dam (Spillway)?

North Lake A Dam (Spillway) serves the following purposes: Navigation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is North Lake A Dam (Spillway)?

North Lake A Dam (Spillway) has a dam height of 15 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 North Lake A Dam (Spillway) last inspected?

North Lake A Dam (Spillway) was last inspected on October 27, 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.