Chapman Dam

GRASS CREEK· St. Lawrence, New York· Built 1971· Concrete· 16 ft tall
Low Hazard Recreation Private

Key Takeaway

Chapman Dam is classified as low hazard in New York. It was completed in 1971 and is 55 years old. Its primary use is recreation.

Physical Details

Dam Height 16 ft (taller than 42.9% in NY)
Dam Length60 ft
Dam TypeConcrete
Max Storage1.8K acre-ft
Normal Storage1.1K acre-ft
Surface Area320 acres
Drainage Area6 sq mi
Max Discharge560 cfs
Year Completed1971 (55 years old)
NID IDNY00387

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: June 14, 1994
State Regulated: Yes
Regulatory Agency: NYS DEC

Ownership

ANDREW J CHAPMAN

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Chapman Dam?

Chapman Dam 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 Chapman Dam?

Chapman Dam is owned by ANDREW J CHAPMAN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Chapman Dam built?

Chapman Dam was completed in 1971, making it 55 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 Chapman Dam?

Chapman 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 Chapman Dam?

Chapman Dam has a dam height of 16 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 Chapman Dam last inspected?

Chapman Dam was last inspected on June 14, 1994. 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.