Johns, Florida, is a privately-owned structure designed for flood risk reduction along the Guana River. With a height of 12 feet and a hydraulic height of 9 feet, the dam serves multiple purposes including flood risk reduction, recreation, and water supply. It has a storage capacity of 282 acre-feet and covers a surface area of 42 acres, with a drainage area of 2.36 square miles.
The dam features a controlled spillway with a width of 20 feet and a slide gate for outlet control. Despite being classified as having a significant hazard potential, the dam is currently in fair condition as of its last inspection in May 2017. The risk assessment for Lake Vedra Dam is very high (1), indicating the importance of implementing proper risk management measures to ensure the safety and integrity of the structure. Located in Ponte Vedra Beach, this earth dam plays a crucial role in protecting the surrounding area from flooding while also providing recreational opportunities and water supply support for the community.
Dam Length |
268 |
Dam Height |
12 |
River Or Stream |
GUANA RIVER |
Primary Dam Type |
Earth |
Surface Area |
42 |
Hydraulic Height |
9 |
Drainage Area |
2.36 |
Nid Storage |
282 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Significant |
Foundations |
Rock, Soil |
Nid Height |
12 |
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