Garnerville Dam

MINISCEONGO CREEK· Rockland, New York· Built 1875· Masonry· 29 ft tall

High Hazard Other Local Government

Key Takeaway

Garnerville Dam is classified as high hazard in New York. It was completed in 1875 and is 151 years old. Its primary use is other. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.

Physical Details

Dam Height	29 ft (taller than 77.5% in NY)
Dam Length	330 ft
Dam Type	Masonry
Max Storage	198 acre-ft
Normal Storage	100 acre-ft

Surface Area	10 acres
Drainage Area	18 sq mi
Year Completed	1875 (151 years old)
NID ID	NY00744

Safety Information

High Hazard

Loss of human life is likely if the dam fails.

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

Emergency Action Plan: Yes

Last Inspection: November 23, 2020

State Regulated: Yes

Regulatory Agency: NYS DEC

Ownership

ROCKLAND COUNTY HIGHWAY DEPARTMENT

Local Government

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Lake Lucille Dam

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Stony Point Dam

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Lake Boyce Dam

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Henrich Pond Dam

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Tomkins Cove Dam

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First Reservoir Dam

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Second Reservoir Dam

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Frequently Asked Questions

What is the hazard classification of Garnerville Dam?

Garnerville Dam is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Garnerville Dam?

Garnerville Dam is owned by ROCKLAND COUNTY HIGHWAY DEPARTMENT (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Garnerville Dam built?

Garnerville Dam was completed in 1875, making it 151 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 Garnerville Dam?

Garnerville Dam serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Garnerville Dam?

Garnerville Dam has a dam height of 29 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 Garnerville Dam last inspected?

Garnerville Dam was last inspected on November 23, 2020. 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.