St. Johns River Water Quality and Manatee Monitoring
Summary
Recent storms dropped the river's salinity, blue-green algae south of town tested toxin-free, and manatee deaths haven't risen. A commissioner asked whether Oak Creek Preserve construction contributed to an August manatee death; without a necropsy, no one can say for sure.
At a glance
- Total mentions
- 7
- Last 30 days
- 1
Discussed at 2 meetings in the last 60 days; most recently Oct 22, 2026.
Impact analysis
Monitoring and restoration projects require ongoing multi-million dollar investments from local and state funding sources.
Everyone who uses or values the river — boaters, anglers, and wildlife.
Aquatic ecosystems and public recreation areas are adversely affected by chronic tributary pollution and harmful algal blooms.
Mentions & discussions (7)
Jacksonville Waterways Commission — October 22, 2026
Recent storms dropped the river's salinity, blue-green algae south of town tested toxin-free, and manatee deaths haven't risen. A commissioner asked whether Oak Creek Preserve construction contributed to an August manatee death; without a necropsy, no one can say for sure.
Jacksonville Waterways Commission — September 17, 2026
Dr. Gerard Pinto updated the commission on drought conditions, elevated salinity levels, and algae blooms affecting the St. Johns River and Doctors Lake.
Jacksonville Waterways Commission — June 10, 2026
Recent manatee deaths, including three at the Queens Harbor lock, prompted commissioners to discuss potential technological solutions like sonar or hydrophones to prevent lock-related strikes.
Jacksonville Waterways Commission — May 13, 2026
Dr. Gerard Pinto shared updates on drought conditions, high salinity, and recent manatee deaths near lock facilities. The commission also advanced funding for continuing manatee protection studies with Jacksonville University.
Jacksonville Waterways Commission — March 11, 2026
Researchers and river advocates briefed the commission on water salinity, algae blooms, submerged grass recovery, and recent manatee deaths due to cold stress and lock incidents. Efforts like oyster garden projects and shoreline hardening are underway to improve local water health.
Jacksonville Waterways Commission — February 11, 2026
The commission reviewed annual manatee mortality and protection reports, discussing ways to improve public awareness among boaters and fishing tournament participants.
Jacksonville Waterways Commission — January 14, 2026
Dr. Gerard Pinto presented the 18th annual State of the River Report, highlighting that while the main stem of the St. Johns River remains relatively stable, local tributaries continue to suffer from high fecal bacteria and nutrient runoff. Commissioners discussed the impacts of septic tanks, sanitary sewer overflows, and phosphorus from agricultural biosolids.
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