Lenape Lake Dam

TR-MATAWA LAKE· Sullivan, New York· Built 1920· Earth· 20 ft tall
Low Hazard Flood Risk Reduction Recreation Private

Key Takeaway

Lenape Lake Dam is classified as low hazard in New York. It was completed in 1920 and is 106 years old. Its primary use is flood risk reduction.

Physical Details

Dam Height 20 ft (taller than 56.3% in NY)
Dam Length75 ft
Dam TypeEarth
Max Storage260 acre-ft
Normal Storage220 acre-ft
Surface Area26 acres
Max Discharge95 cfs
Year Completed1920 (106 years old)
NID IDNY01281

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: January 19, 2010
State Regulated: Yes
Regulatory Agency: NYS DEC

Ownership

LENAPE LAKE INC

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Lenape Lake Dam?

Lenape Lake 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 Lenape Lake Dam?

Lenape Lake Dam is owned by LENAPE LAKE INC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Lenape Lake Dam built?

Lenape Lake Dam was completed in 1920, making it 106 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 Lenape Lake Dam?

Lenape Lake Dam serves the following purposes: Flood Risk Reduction, Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

How tall is Lenape Lake Dam?

Lenape Lake Dam has a dam height of 20 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 Lenape Lake Dam last inspected?

Lenape Lake Dam was last inspected on January 19, 2010. 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.