Holly Oaks Lake Dam

MILL COVE-ST. JOHNS· Duval, Florida· Earth· 6 ft tall
Significant Hazard Flood Risk Reduction Recreation Water Supply Private

Key Takeaway

Holly Oaks Lake Dam is classified as significant hazard in Florida. Its primary use is flood risk reduction. Significant hazard means failure could cause economic or environmental damage. Learn more.

Physical Details

Dam Height 6 ft (taller than 0.3% in FL)
Dam Length495 ft
Dam TypeEarth
Max Storage64 acre-ft
Normal Storage51 acre-ft
Surface Area24 acres
Drainage Area2 sq mi
NID IDFL67000

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: May 10, 2017
State Regulated: Yes
Regulatory Agency: FDEP

Ownership

CATHERINE B. WHATLEY

Private

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Holly Oaks Lake Dam?

Holly Oaks Lake 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 Holly Oaks Lake Dam?

Holly Oaks Lake Dam is owned by CATHERINE B. WHATLEY (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

What is the primary purpose of Holly Oaks Lake Dam?

Holly Oaks Lake 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 Holly Oaks Lake Dam?

Holly Oaks Lake Dam has a dam height of 6 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 Holly Oaks Lake Dam last inspected?

Holly Oaks Lake Dam was last inspected on May 10, 2017. 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.