Mountain Lake Dam

WHITE LAKE BROOK· Sullivan, New York· Built 1928· Earth· 10 ft tall
Low Hazard Recreation Water Supply Private

Key Takeaway

Mountain Lake Dam is classified as low hazard in New York. It was completed in 1928 and is 98 years old. Its primary use is recreation.

Physical Details

Dam Height 10 ft (taller than 12.4% in NY)
Dam Length200 ft
Dam TypeEarth
Max Storage394 acre-ft
Normal Storage210 acre-ft
Surface Area64 acres
Drainage Area9 sq mi
Max Discharge30 cfs
Year Completed1928 (98 years old)
NID IDNY00765

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 12, 2011
State Regulated: Yes
Regulatory Agency: NYS DEC

Ownership

SMALLWOOD ESTATES INC

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Mountain Lake Dam?

Mountain 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 Mountain Lake Dam?

Mountain Lake Dam is owned by SMALLWOOD ESTATES INC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Mountain Lake Dam built?

Mountain Lake Dam was completed in 1928, making it 98 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 Mountain Lake Dam?

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

How tall is Mountain Lake Dam?

Mountain Lake Dam has a dam height of 10 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 Mountain Lake Dam last inspected?

Mountain Lake Dam was last inspected on October 12, 2011. 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.