Holly Oaks Lake Dam

About Holly Oaks Lake Dam

The primary purpose of Holly Oaks Lake Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Catherine B. Whatley (private). It impounds the Mill Cove-st. Johns near Jacksonville.

The dam stands 6 feet tall and stretches 495 feet across, creates a reservoir covering 24 acres, has a maximum storage capacity of 64 acre-feet, and collects water from a drainage area of 1 square miles.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 05/10/2017.

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