Unicorn Branch Dam

Unicorn Branch· Queen Anne's, Maryland· Built 1964· Earth· 13 ft tall
Significant Hazard Recreation State Government

Key Takeaway

Unicorn Branch Dam is classified as significant hazard in Maryland. It was completed in 1964 and is 62 years old. Its primary use is recreation. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 13 ft (taller than 14.1% in MD)
Dam Length927 ft
Dam TypeEarth
Max Storage539 acre-ft
Normal Storage116 acre-ft
Surface Area48 acres
Drainage Area20 sq mi
Max Discharge4,626 cfs
Year Completed1964 (62 years old)
Year Modified1996
NID IDMD00047

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: Yes
Last Inspection: December 21, 2020
State Regulated: Yes
Regulatory Agency: MD Dam Safety

Ownership

MD DNR-Public Lands, Engineering & Constr-Eastern

State Government

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Frequently Asked Questions

What is the hazard classification of Unicorn Branch Dam?

Unicorn Branch 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 Unicorn Branch Dam?

Unicorn Branch Dam is owned by MD DNR-Public Lands, Engineering & Constr-Eastern (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Unicorn Branch Dam built?

Unicorn Branch Dam was completed in 1964, making it 62 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 Unicorn Branch Dam?

Unicorn Branch 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 Unicorn Branch Dam?

Unicorn Branch Dam has a dam height of 13 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 Unicorn Branch Dam last inspected?

Unicorn Branch Dam was last inspected on December 21, 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.