Lake Vedra Dam Reservoir Report

Nearby: Stj05 Stj04

Last Updated: December 5, 2025

Lake Vedra Dam in St.


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Summary

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
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.