D. O. Allen Dam

GARDNER HOLLOW· Ozark, Missouri· Built 1985· Earth· 25 ft tall

High Hazard Recreation Private

Key Takeaway

D. O. Allen Dam is classified as high hazard in Missouri. It was completed in 1985 and is 41 years old. Its primary use is recreation. 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	25 ft (taller than 23.5% in MO)
Dam Type	Earth
Max Storage	160 acre-ft
Normal Storage	100 acre-ft

Surface Area	12 acres
Drainage Area	450 sq mi
Year Completed	1985 (41 years old)
NID ID	MO31881

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: No

Last Inspection: December 23, 1985

State Regulated: No

Ownership

D. O. ALLEN

Private

Nearby Dams

Gardner Dam

Ozark, MO

Low Hazard 25 ft

Mallow Lake Dam

Ozark, MO

High Hazard 25 ft

Jackson Lake Dam

Douglas, MO

Low Hazard 29 ft

Herd Dam

Ozark, MO

High Hazard 30 ft

Frequently Asked Questions

What is the hazard classification of D. O. Allen Dam?

D. O. Allen 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 D. O. Allen Dam?

D. O. Allen Dam is owned by D. O. ALLEN (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was D. O. Allen Dam built?

D. O. Allen Dam was completed in 1985, making it 41 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 D. O. Allen Dam?

D. O. Allen 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 D. O. Allen Dam?

D. O. Allen Dam has a dam height of 25 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 D. O. Allen Dam last inspected?

D. O. Allen Dam was last inspected on December 23, 1985. 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.