Lake Ralph Dam

TRIBUTARY TO KOKOSING RIVER· Knox, Ohio· Earth· 19 ft tall
Significant Hazard Recreation Private

Key Takeaway

Lake Ralph Dam is classified as significant hazard in Ohio. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 19 ft (taller than 24.6% in OH)
Dam Length344 ft
Dam TypeEarth
Max Storage26 acre-ft
Normal Storage16 acre-ft
Surface Area3 acres
Drainage Area0 sq mi
Max Discharge60 cfs
NID IDOH01852

Safety Information

Significant Hazard

No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities.

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

Emergency Action Plan: No
Last Inspection: November 14, 2019
State Regulated: Yes
Regulatory Agency: Department of Natural Resources

Ownership

Jeff Ulery

Private

Nearby Dams

Apple Valley Lake Dam

Knox, OH

High Hazard 91 ft

Neutralized Water Impoundment 2

Knox, OH

Significant Hazard 22 ft

Millwood Plant Dam

Knox, OH

Significant Hazard 14 ft

Neutralized Water Impoundment 3

Knox, OH

Significant Hazard 20 ft

Knox Cattle Company Dam

Knox, OH

High Hazard 20 ft

Lakeview Lake Dam

Knox, OH

Low Hazard 23 ft

Lake Viering Dam

Knox, OH

High Hazard 47 ft

Workman Lake Dam

Knox, OH

Significant Hazard 30 ft

Frequently Asked Questions

What is the hazard classification of Lake Ralph Dam?

Lake Ralph Dam is classified as Significant Hazard. No probable loss of human life, but can cause economic loss, environmental damage, or disruption of lifeline facilities. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Lake Ralph Dam?

Lake Ralph Dam is owned by Jeff Ulery (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Lake Ralph Dam?

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

How tall is Lake Ralph Dam?

Lake Ralph Dam has a dam height of 19 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 Ralph Dam last inspected?

Lake Ralph Dam was last inspected on November 14, 2019. 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.