Lake Oneida

CONNOQUENESSING CREEK· Butler, Pennsylvania· Built 1918· Earth· 38 ft tall
High Hazard Water Supply Private

Key Takeaway

Lake Oneida is classified as high hazard in Pennsylvania. It was completed in 1918 and is 108 years old. Its primary use is water supply. 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 38 ft (taller than 75.2% in PA)
Dam Length830 ft
Dam TypeEarth
Max Storage3.4K acre-ft
Normal Storage1.8K acre-ft
Surface Area155 acres
Drainage Area17 sq mi
Year Completed1918 (108 years old)
NID IDPA00272

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: June 8, 2020
State Regulated: Yes
Regulatory Agency: Pennsylvania Department of Environmental Protection

Ownership

PA AMERICAN WATER COMPANY

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Lake Oneida?

Lake Oneida 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 Lake Oneida?

Lake Oneida is owned by PA AMERICAN WATER COMPANY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Lake Oneida built?

Lake Oneida was completed in 1918, making it 108 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 Lake Oneida?

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

How tall is Lake Oneida?

Lake Oneida has a dam height of 38 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 Lake Oneida last inspected?

Lake Oneida was last inspected on June 8, 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.