Seawall & Bulkhead Services in Fernandina Beach, FL
Fernandina Beach sits on the Amelia River near the St. Marys River entrance, where NOAA records a mean tide range of about 6 ft. Here is what a range that large means for seawall and bulkhead design, inspection and construction, and who permits the work.
Northeast Florida: Duval, St. Johns, Nassau, Clay, Flagler, Putnam counties.
What does Fernandina Beach's large tide range mean for a seawall or bulkhead?
NOAA's Fernandina Beach gauge on the Amelia River has a mean tide range of 6.02 ft, so a large band of wall face, toe and hardware is wetted and exposed twice a day. That affects cap height, scour checks and when crews can reach the toe. Barefoot Marine Construction serves Fernandina Beach, Amelia Island and Nassau County directly.
How service works in Fernandina Beach
Barefoot Marine Construction, the owner and operator of Florida Bulk Head, works directly with waterfront property owners in this region.
Call (904) 821-5744 or send your project details and photos. Barefoot Marine Construction reviews every Northeast Florida request itself and follows up to schedule a site visit when one is needed.
Six-Foot Tides at Fernandina Beach
NOAA's Fernandina Beach water level station (8720030) has a mean range of 6.02 ft and a great diurnal range of 6.56 ft for the 1983-2001 tidal epoch. Among the NOAA stations reviewed for Northeast Florida, it is the largest. Mayport, at the mouth of the St. Johns River, has 4.53 ft; downtown Jacksonville has 1.79 ft. The station's record also runs back to 1897, and NOAA's sea level trend for it is 0.91 inches per decade through 2025.
| Datum | Approx. ft NAVD88 | Meaning |
|---|---|---|
| Mean higher high water (MHHW) | 2.7 | Average of each day's higher high tide |
| Mean high water (MHW) | 2.4 | Average of all high tides |
| Mean low water (MLW) | -3.6 | Average of all low tides |
| Mean lower low water (MLLW) | -3.8 | Average of each day's lower low tide; chart datum |
| NWS minor flood threshold | 4.7 | About 2.0 ft above MHHW |
| NWS major flood threshold | 6.2 | About 3.5 ft above MHHW |
Those averages hide a lot of variation. Averaging NOAA's 2026 high and low predictions gives about 5.8 ft, close to the epoch value. Individual swings from one tide to the next run from roughly 3.3 ft on neap tides to about 8.5 ft on the largest spring tides. Treat these derived figures as approximate.
What a Large Tide Range Means for Your Wall
The points below are general engineering reasoning, not site advice. Every wall needs its own evaluation, and structural design should come from a Florida-licensed professional engineer.
- Wall height and embedment. The wall has to retain soil above the highest regular tides and still reach far enough below the mudline to stay stable when the water is at its lowest. A bigger range generally means a taller exposed face for the same lot elevation, which raises the demand on embedment, anchors or both.
- Toe exposure. At spring low tides, more of the toe and the mudline in front of the wall can be seen, so scour, undermining and soil loss show up sooner. The same exposure lets currents and wakes work at the toe across a wider band of water levels.
- Rapid drawdown. When the tide falls faster than water can drain from the soil behind the wall, the wall briefly holds back a higher water level on the land side. Drainage, filter fabric and weep details help manage this.
- The wet-dry band. Concrete, steel, fasteners and timber in the zone that is wetted and dried twice a day typically wear fastest. Inspections should focus there and on the cap.
- Work windows. Toe work, scour stone, cap repairs and inspections are scheduled around low water, often in short windows, and spring tides give more room than neap tides.
Storm Tides on the Amelia River
Storm records at the Fernandina Beach gauge show how far above normal high tide the water can go. The station's highest recorded level dates to October 2, 1898, about 6.9 ft above mean higher high water on NOAA's current datums. Recent storms have come within about 3 ft of that.
| Storm | Reported Value |
|---|---|
| Hurricane Matthew (Oct. 2016) | Storm surge of 6.96 ft; storm tide 4.17 ft above MHHW |
| Hurricane Irma (Sept. 2017) | Peak water level 3.6 ft above MHHW |
| Hurricane Nicole (Nov. 2022) | Storm surge 4.65 ft; storm tide 6.55 ft NAVD88 |
Storm surge is measured against the predicted tide, while storm tide is the total water level, so the two numbers differ depending on the tide when the surge peaks. In Irma, the Hurricane Center also reported major or record flood stages on rivers in Nassau County. A seawall cap set near the high-tide line can be overtopped in events like these, so plan backfill, drainage and landscaping with that in mind.
The City's Downtown Resiliency Seawall
The City of Fernandina Beach has pursued a multi-phase Historic Downtown Resiliency Seawall along its downtown Amelia River waterfront. A December 2023 state funding request describes a 1.1 mile protective seawall intended to protect the district from future sea-level-rise flooding, with one phase complete at that time. Check with the City for current status.
Permits in Fernandina Beach and on Amelia Island
Which local office handles your permit depends on whether the property is inside city limits. The City of Fernandina Beach Building Department at 204 Ash Street issues permits in the city, and its permits page points to the new CityView online system. Properties elsewhere on Amelia Island and in the rest of Nassau County go through Nassau County Building & Community Services, which uses the Accela portal. State review runs through DEP's Northeast District, and waterfront work can also involve the U.S. Army Corps of Engineers.
Questions to Settle Early
- Is the property inside City of Fernandina Beach limits or in unincorporated Nassau County?
- Is the work a restoration at or within 18 inches of the existing wall, or something new?
- Does DEP consider the shoreline an estuary where vertical-wall limits apply?
- Does the project need review by a City board, such as the Historic District Council?
- Is any part of the work seaward of the Coastal Construction Control Line?
- Will equipment work from land, or from a barge in tidal current?
Working With Barefoot in Fernandina Beach
Nassau County is one of the six counties Barefoot Marine Construction serves directly from Jacksonville, so a request from Fernandina Beach or elsewhere on Amelia Island goes to the company itself. The usual steps are Request a Quote, Site Assessment, Plan & Permit, Build or Repair, and Protect Your Property; with a tide this large, the Site Assessment and the build schedule both follow the low-water calendar. When you call (904) 821-5744 or send photos and project details, take the photos near low tide if you can so the toe and lower face show, and say whether the lot is inside city limits.
Shorelines and waterways in Fernandina Beach
Amelia River
FWC describes the Amelia River as running north to south along the interior of Amelia Island, connecting the Nassau River to the St. Marys River, with a diurnal tidal range of 1.5 to 2 m (4.9 to 6.6 ft). NOAA's Fernandina Beach gauge sits here, with a mean range of 6.02 ft.
South Amelia River (Intracoastal Waterway)
FDEP's paddling-trail guide identifies the South Amelia River as the Intracoastal Waterway and warns that the current is very strong at the State Road 200 (A1A) bridge. NOAA's Amelia City station on the South Amelia River lists a mean range of 5.39 ft.
St. Marys River Entrance
The St. Marys River forms the Florida-Georgia line at the north end of Amelia Island. NOAA's St. Marys River entrance station has a mean range of 5.96 ft, and FDEP's guide advises paddlers near Fort Clinch to hug the shore to avoid swift currents.
Atlantic Ocean Beachfront
Amelia Island's Atlantic beaches fall under DEP's Coastal Construction Control Line program. NHC reported moderate beach erosion in Nassau County during Hurricane Matthew, with several washouts along Ocean Boulevard.
Local construction considerations
Cap Height Starts From a High Base
NOAA's datums put mean higher high water about 2.7 ft above NAVD88 here, and the National Weather Service minor flood threshold about 2.0 ft above that. Cap height is a design and permitting decision, so compare any proposal against both and against the storm record.
Low-Water Work Windows
Toe repairs, scour protection and inspections are usually timed to low water. NOAA's 2026 predictions show individual tides here swinging from roughly 3.3 ft to about 8.5 ft, so spring low tides open the widest windows and neap tides the narrowest.
Strong Currents in the Channels
FDEP's guide warns of very strong current at the SR 200 (A1A) bridge and swift currents near Fort Clinch. Currents affect barge positioning, turbidity controls and scour at the toe.
City or County Jurisdiction
Inside city limits the City of Fernandina Beach Building Department issues permits; elsewhere on Amelia Island, Nassau County Building & Community Services does. The City's Planning & Conservation Department takes applications to boards such as the Historic District Council, so ask whether your project needs board review.
Common seawall concerns
- Toe scour and soil washout where strong tidal currents and boat traffic work at the base of the wall
- Wear in the tidal band: concrete spalling and corrosion of exposed steel and fasteners
- Soil loss through joints as water drains out behind the wall on each falling tide
- Tie-back and anchor problems on older walls exposed to repeated wetting
- Overtopping risk during storm tides, such as Nicole's 6.55 ft NAVD88 peak at the Fernandina Beach gauge
- Storm damage after hurricanes and nor'easters, with Matthew's 6.96 ft surge at the gauge as a benchmark
Regional cost factors
- Wall height needed to span a 6 ft tide range plus embedment below the dredge or scour line
- Scheduling toe and cap work around low-water windows and spring and neap tides
- Current and wave exposure, which affects scour protection and equipment setup on the water
- Material and fastener choices for full-strength salt water and a wide wet-dry band
- Permitting path: City or Nassau County, state ERP or exemption, and CCCL review on the ocean side
- Access through historic or tightly built lots, or from the water by barge
Permitting agencies and local rules
- State of Florida (Amelia River): Rule 68D-24.019, F.A.C. sets an idle speed, no wake zone from shoreline to shoreline in the Amelia River at Fernandina Beach, from the extended centerline of Dade Street to 400 ft south of Cedar Street, bounded on the west by the mouth of Bells River. Official source
- State of Florida: Section 403.813(1)(e), F.S. exempts restoring a seawall at, upland of, or within 18 inches waterward of its previous location, with conditions. Section 373.414(5), F.S. limits new vertical seawalls in estuaries and lagoons and generally calls for riprap facing on repair or replacement there unless an exception applies; confirm with DEP whether it applies to your shoreline. Official source
- State of Florida (oceanfront): Unless exempt, construction seaward of the Coastal Construction Control Line on Amelia Island's Atlantic beaches needs a DEP CCCL permit. Nassau County's line is described in Rule 62B-26.005, F.A.C. (opens in a new tab). Official source
- City of Fernandina Beach Building Department Permits204 Ash Street; the permits page links to the City's new CityView online permitting system
- Nassau County Building & Community ServicesUnincorporated Amelia Island and the rest of Nassau County; Accela online permitting
- Florida DEP Northeast DistrictState environmental resource permits and exemptions
- St. Johns River Water Management District ePermitDistrict permitting portal
- Florida DEP Coastal Construction Control Line ProgramAtlantic beachfront work on Amelia Island
Requirements depend on your exact property, waterway and scope. Confirm with each agency. See the Florida seawall permit guide.
More communities in Northeast Florida
Bulkhead and seawall services from Barefoot Marine Construction
Fernandina Beach seawall and bulkhead questions
How big is the tide in Fernandina Beach?
NOAA's Fernandina Beach station has a mean range of 6.02 ft and a great diurnal range of 6.56 ft. Individual tides vary, and NOAA's 2026 predictions show swings from roughly 3 ft to more than 8 ft. That is far larger than the ranges along the St. Johns River in Jacksonville and Clay County.
Does a large tide range mean my seawall needs to be taller?
Often the issue is total wall length rather than just cap height. The wall must retain soil above high tide and stay embedded deep enough to be stable at low tide, so a large range can mean longer panels or sheets, stronger anchors or both. A Florida-licensed engineer sets those dimensions for your site.
Why do contractors schedule seawall work around the tides here?
Toe repairs, scour protection and inspections of the lower wall are easiest at low water. With a range this large, low-water windows are short and change daily, and spring tides open more of the wall than neap tides. Strong currents in parts of the Amelia River also affect when barges and turbidity controls can be set.
Who issues seawall permits on Amelia Island?
Inside Fernandina Beach city limits, the City Building Department issues permits. Elsewhere on the island, Nassau County Building & Community Services handles them. State review through DEP's Northeast District, and in some cases the Corps of Engineers, applies in both.
Does the Coastal Construction Control Line apply to my Amelia River seawall?
Generally not. DEP's CCCL program covers the sandy beaches fronting the Atlantic, and the line marks the landward limit of that jurisdiction. A wall on the Amelia River or South Amelia River goes through the City or Nassau County plus DEP's environmental resource rules or an exemption. Work on Amelia Island's Atlantic beachfront is the part that can need a CCCL permit.
Sources and references
- Datums for 8720030, Fernandina Beach, FL — NOAA Tides and Currents. Accessed November 2, 2026. Same datum page format used for Amelia City (8720086), St. Marys River entrance (8720011) and Mayport (8720218); flood thresholds and 2026 predictions from NOAA's station data
- Relative sea level trend, 8720030 Fernandina Beach — NOAA Tides and Currents. Accessed November 2, 2026.
- Oyster Integrated Mapping and Monitoring Program, Chapter 9: Northeast Florida — Florida Fish and Wildlife Conservation Commission. Accessed November 2, 2026.
- Florida Circumnavigational Saltwater Paddling Trail, Segment 26 guide (July 2026) — Florida Department of Environmental Protection. Accessed November 2, 2026.
- Tropical Cyclone Report: Hurricane Matthew (AL142016) — National Hurricane Center. Accessed November 2, 2026.
- Tropical Cyclone Report: Hurricane Nicole (AL172022) — National Hurricane Center. Accessed November 2, 2026.
- Tropical Cyclone Report: Hurricane Irma (AL112017) — National Hurricane Center. Accessed November 2, 2026.
- Local Funding Initiative Request 2838: Fernandina Beach Historic Downtown Resiliency Seawall Construction Project (FY 2024-25) — The Florida Senate. Accessed November 2, 2026.
Regulations, programs and conditions change. Always confirm requirements with the agency that has jurisdiction over your property.