Northeast Florida braces for weeks-long St. Johns River flooding

Gov. Ron DeSantis expanded Florida's state of emergency Wednesday to include seven additional counties as the National Weather Service forecasts minor to moderate flooding along the St. Johns River that could last several weeks. The expansion adds Lake, Seminole, and Volusia counties to the emergency declaration — three counties in the First Coast Observer coverage area.

The emergency order, which now covers 14 counties statewide, comes after more than 19 inches of rain fell within 12 hours in parts of Palm Beach County, including Riviera Beach. The governor's original Nov. 2 declaration included Brevard, DeSoto, Hardee, Highlands, Indian River, Martin and St. Lucie counties. Wednesday's expansion added Glades, Hendry, Lake, Okeechobee, Palm Beach, Seminole and Volusia.

What's happening

The expanded emergency order specifically references National Weather Service forecasts calling for minor to moderate flooding along the St. Johns River that could persist for several weeks. The river, which flows northward through the heart of Northeast Florida and bisects Jacksonville, drains a basin that extends south through Brevard and into central Florida.

Florida Realtors' Disaster Relief Fund has opened applications to help eligible members in all 14 counties whose homes or real estate offices sustained serious damage. The fund assists Realtors, their employees, local associations and association staff whose primary residences or real estate offices sustain serious physical or structural damage, including water intrusion. Applicants must have been part of the Realtor family before the disaster.

To apply, applicants must provide color photos showing damage, an insurance summary page showing coverage and deductibles, and an insurer's written damage assessment along with repair estimates and qualifying repair receipts. The individual application cannot be saved partway through and must be completed in one session.

River communities face prolonged flood threat

The St. Johns River's unique northward flow means heavy rainfall in central Florida counties feeds elevated water levels downstream in Duval, Clay, St. Johns, and Putnam counties days or even weeks later. Minor to moderate flooding along the river typically affects homes, docks, and low-lying roads in riverfront communities from Palatka north through Jacksonville to the river's mouth at Mayport.

River flooding of the duration forecast by the National Weather Service would affect neighborhoods along the main stem of the St. Johns and its major tributaries, including Julington Creek in St. Johns County, and the Ortega and Trout rivers in Duval. Communities with homes on or near the river — including Riverside, Ortega, Mandarin, Switzerland, and San Marco in Jacksonville, and Fruit Cove and Julington Creek Plantation in St. Johns County — typically monitor river-gauge levels closely during prolonged rain events.

Moderate flooding on the St. Johns can inundate boat ramps, flooding parking areas and access roads. It can also submerge docks and floating piers, damage shoreline stabilization structures, and push water into yards and ground-floor spaces of homes built in the floodplain before current elevation standards took effect. The duration of the forecast flood event raises the risk of sustained water intrusion, which can lead to mold, structural damage to wood framing, and failures of HVAC systems and water heaters installed at grade.

The economic impact extends beyond property damage. Real estate transactions in flood-affected areas may face delays as buyers wait for water to recede before completing inspections, and appraisers may need to return to properties once conditions normalize. Homes that suffer flood damage during a declared emergency may see changes in their flood-insurance status or premiums, particularly if claims are filed.

What this means for property owners and buyers

Flood events of this type underscore the importance of flood-zone designations and insurance coverage in riverfront real estate transactions. Homes in FEMA-designated Special Flood Hazard Areas — the high-risk zones shown on Flood Insurance Rate Maps — require flood insurance if they carry a federally backed mortgage. But moderate flooding along the St. Johns can affect properties outside mapped high-risk zones, particularly where topography creates low-lying pockets or where stormwater infrastructure is undersized.

For property owners in the flood emergency counties, documenting damage thoroughly is critical for insurance claims and any disaster-assistance applications. Photographs should capture water-level marks on walls, damaged building materials, and affected mechanical systems before cleanup begins. Homeowners should notify their insurers promptly and keep records of all repair estimates and contractor invoices.

Prospective buyers and investors evaluating riverfront or near-river properties in Northeast Florida typically examine several flood-risk indicators: the property's FEMA flood zone, its base flood elevation relative to the finished-floor elevation of the home, the history of flooding in the immediate area, and current flood-insurance premiums. A prolonged flood event provides a real-time test of a property's vulnerability and can reveal drainage or elevation issues that may not be apparent during dry conditions.

Real estate professionals in affected counties who have questions about contract obligations or deadlines during the emergency can contact the Florida Realtors Legal Hotline at 407-438-1409. Technology support for business-continuity issues is available through the Florida Realtors Tech Helpline at 407-587-1450.

Rainfall, river levels, and timing

The St. Johns River's slow-moving character means the river responds gradually to upstream rainfall. Water levels at gauges in Duval and Clay counties can continue to rise for days after rain has stopped, as runoff works its way downstream through the river's wide, shallow basin. Flood stages vary by location; the National Weather Service maintains river gauges at Astor, DeLand, Sanford, Lake Harney, and several points in the Jacksonville area, each with specific flood-stage thresholds.

Minor flood stage typically means water begins to encroach on low-lying roads, parks, and boat ramps. Moderate flood stage brings water into yards and may affect structures near the river, particularly those without elevated foundations. The forecast duration of several weeks suggests sustained high water rather than a brief crest, which increases the exposure time for vulnerable structures and complicates response and recovery efforts.

Residents in flood-prone areas along the river often use sandbags to protect doorways, garages, and crawl spaces when the river is forecast to reach or exceed minor flood stage. St. Johns River Water Management District, the regional water authority, monitors basin conditions and lake levels in the upper basin; its flood-control operations on Lake Washington, Lake Winder, and other headwater lakes influence downstream flow rates, but the agency's ability to mitigate flooding is limited during large regional rainfall events.

What happens next

The state of emergency remains in effect until the governor's office rescinds or modifies the order. State emergency-management resources, including the Florida Division of Emergency Management and the Florida National Guard, are available to assist local governments in the 14 declared counties with flood-response and recovery operations.

Property owners and real estate offices in Lake, Seminole, and Volusia counties who suffer serious physical or structural damage, including water intrusion, may apply for assistance through the Florida Realtors Disaster Relief Fund. Applications require completion in a single session and must include documentation of damage, insurance coverage, and repair costs. Loss of income and some types of property damage do not qualify under the fund's guidelines.

River levels and flood forecasts are updated regularly by the National Weather Service and can be monitored through the Advanced Hydrologic Prediction Service website. Residents in riverfront communities should monitor local river gauges and heed any evacuation or road-closure notices issued by county emergency management.

The forecast of weeks-long flooding along the St. Johns River highlights the cumulative effects of growth and climate variability on Northeast Florida's signature waterway. As thousands of new homes rise each year in Clay, St. Johns, and Duval counties — many within the St. Johns basin — the region's ability to manage stormwater, preserve floodplain capacity, and communicate flood risk to new and existing residents will remain a defining infrastructure challenge for local governments and the real estate market alike.