Pyrites Intake

Grass River· St. Lawrence, New York· Built 1908· Concrete· 27 ft tall
Low Hazard Hydroelectric Private

Key Takeaway

Pyrites Intake is classified as low hazard in New York. It was completed in 1908 and is 118 years old. Its primary use is hydroelectric.

Physical Details

Dam Height 27 ft (taller than 74.7% in NY)
Dam Length385 ft
Dam TypeConcrete
Max Storage27 acre-ft
Normal Storage27 acre-ft
Surface Area5 acres
Drainage Area333 sq mi
Max Discharge0 cfs
Year Completed1908 (118 years old)
NID IDNY00015

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 15, 2022
State Regulated: No

Ownership

Pyrites Hydro, LLC

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Pyrites Intake?

Pyrites Intake 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 Pyrites Intake?

Pyrites Intake is owned by Pyrites Hydro, LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Pyrites Intake built?

Pyrites Intake was completed in 1908, making it 118 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 Pyrites Intake?

Pyrites Intake 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 Pyrites Intake?

Pyrites Intake has a dam height of 27 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 Pyrites Intake last inspected?

Pyrites Intake was last inspected on June 15, 2022. 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.