Stillwater Dam

LACKAWANNA RIVER· Susquehanna, Pennsylvania· Built 1960· Rockfill· 77 ft tall

High Hazard Flood Risk Reduction Recreation Water Supply Federal Government

Key Takeaway

Stillwater Dam is classified as high hazard in Pennsylvania. It was completed in 1960 and is 66 years old. Its primary use is flood risk reduction. 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	77 ft (taller than 92.9% in PA)
Dam Length	1,700 ft
Dam Type	Rockfill
Max Storage	17.0K acre-ft
Normal Storage	12.0K acre-ft

Surface Area	422 acres
Drainage Area	37 sq mi
Max Discharge	37,780 cfs
Year Completed	1960 (66 years old)
NID ID	PA00006

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: August 9, 2023

State Regulated: No

Ownership

USACE - Baltimore District

Federal Government

Nearby Dams

Lewis Lake

Susquehanna, PA

High Hazard 15 ft

Brace Brook

Wayne, PA

Low Hazard 23 ft

Lowe Lake

Susquehanna, PA

Significant Hazard 5 ft

Four Seasons Lake

Susquehanna, PA

Significant Hazard 12 ft

Belmont Lake

Wayne, PA

High Hazard 28 ft

Ross

Susquehanna, PA

Significant Hazard 21 ft

Hartwig

Wayne, PA

Low Hazard 17 ft

Hankins Pond

Wayne, PA

High Hazard 26 ft

Frequently Asked Questions

What is the hazard classification of Stillwater Dam?

Stillwater 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 Stillwater Dam?

Stillwater Dam is owned by USACE - Baltimore District (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Stillwater Dam built?

Stillwater Dam was completed in 1960, making it 66 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 Stillwater Dam?

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

How tall is Stillwater Dam?

Stillwater Dam has a dam height of 77 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 Stillwater Dam last inspected?

Stillwater Dam was last inspected on August 9, 2023. 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.