Seawall & Bulkhead Contractor in Northeast Florida

One Region, Very Different Waters

Northeast Florida's waterfront is not one environment. Within the six counties Barefoot Marine Construction serves directly, a wall can face ocean surf, a swift tidal channel on the Matanzas River, a marsh creek off the Intracoastal Waterway, or a slow reach of the St. Johns River with less than a foot of tide. Each changes how much of the wall is exposed at low tide, how hard currents work the toe, and how high storm water has climbed.

Tide range is the clearest example. NOAA's long-term mean ranges for stations across the region run from more than 6 ft at Fernandina Beach to under 1 ft on the river at the Buckman Bridge and in Doctors Lake.

Mean range is NOAA's long-term average difference between mean high and mean low water. Individual days vary with the moon, wind and river flow.

The St. Johns River and Its Salinity Gradient

The St. Johns River Water Management District describes the St. Johns as “one of the few rivers in the United States that flows north.” It drops less than 30 feet over a 310-mile run, about an inch per mile, so incoming tides reverse its flow twice a day and can push water upstream as far as Lake Monroe. The District defines the lower basin as northeast Florida from Putnam County to the river's mouth in Duval County, which puts most riverfront property in Barefoot's service area on this single tidal system.

Florida Fish and Wildlife Conservation Commission (FWC) reporting divides the lower river into three zones:

• Mayport to downtown Jacksonville (mesohaline). Narrow, deep and fast flowing, with average salinity of 14.5 and active tidal influence.
• Downtown Jacksonville to Doctors Lake (oligohaline). Wide, shallow and slow, with average salinity of 2.9 and moderate tidal influence.
• Doctors Lake to Lake George (freshwater lacustrine). Average salinity of 0.5 and weak tidal influence, although NOAA still measures a 1.27 ft mean range at Palatka.

FWC also reports that the estuary's average salinity increased from 2008 to 2022. The gradient is practical, not academic: a wall at Mayport sees salty water and a 4.5 ft tide, while a wall on Doctors Lake sees fresher water and a tide under a foot, yet storm water still travels up the river. Material choices and wet-dry exposure follow from where the property sits, and the engineer confirms both for the site.

The Intracoastal Waterway and Tidal Creeks

The Atlantic Intracoastal Waterway (ICW) runs the length of the coast here. NOAA station names place it at Pablo Creek in Duval County, at Palm Valley and on the Tolomato River in north St. Johns County, and at Fort Matanzas to the south. FWC notes that the St. Johns River is connected to the Tolomato River via the ICW.

Tide range along the ICW does not change in a straight line. NOAA lists mean ranges of 3.77 ft at the Pablo Creek ICWW bridge, 4.66 ft at Palm Valley and 4.24 ft on the Tolomato at Vilano Beach, then just 1.47 ft at Bings Landing in Flagler County. Around Palm Valley, FWC reports that the abundance of seawalls limits intertidal oyster habitat, a sign of how heavily armored parts of this corridor already are.

Behind the ICW and along the river lie many tidal creeks. The City of Jacksonville alone counts more than 59 tributaries and more than 1,500 miles of shoreline, about 100 linear miles of it hardened. In the Nassau River marshes, FWC reports salinity ranging from 0.01 to 46. On creek lots, water depth, soils and equipment access shape how a project is staged, so settle them early.

Storm History That Shapes Wall Design

Four recent storms left official high-water records across the region, documented by National Hurricane Center (NHC) reports and the Florida Department of Environmental Protection (FDEP). MHHW is mean higher high water; NAVD88 is the North American Vertical Datum of 1988.

Two lessons stand out. The river floods from more than one direction: NHC found that Irma's rise downtown began with seawater pushed upstream and kept climbing after salinity fell, pointing to rainfall runoff as a significant contributor. And the oceanfront behaves differently from interior waters. FDEP's armoring counts cover Atlantic-fronting structures only, and Nicole did far more of that damage in St. Johns and Flagler than Ian.

Water levels are also creeping up. The City of Jacksonville reports sea level rise at Mayport of about 0.11 inches per year from 1928 to 2022 and anticipates high tide flood days there growing from four in 2021 to 40 to 60 by 2050. Cap height is worth discussing early, though no seawall prevents storm flooding.

Northeast Florida Construction Considerations

The Permitting Path in Northeast Florida

Several agencies can be involved in a single seawall project. For a typical single-family lot in the six counties, the path usually includes:

1. Local building permit. Issued by the city or county where the property sits. The City of Jacksonville requires online submission through JaxEPICS; the Duval beach cities, St. Augustine, St. Augustine Beach, Fernandina Beach, Orange Park, Palm Coast, Flagler Beach and Palatka run their own offices, and unincorporated areas are permitted by the county.
2. State Environmental Resource Permit (ERP) review. Under the DEP and water management district operating agreements, DEP generally reviews docks that are not part of a larger development, projects serving a single-family home that is not part of a larger plan, and work seaward of the CCCL. The FDEP Northeast District in Jacksonville covers all six counties. The water management district, the St. Johns River Water Management District for most of the region, reviews the rest. Some seawall work qualifies for exemptions under section 403.813(1), F.S., each with conditions.
3. State-owned submerged lands. FDEP's exemption rule (62-330.051, F.A.C.) says exempt work in, on or over state-owned submerged lands is subject to a separate authorization under chapters 253 and 258, F.S.
4. Federal authorization. The U.S. Army Corps of Engineers, Jacksonville District, regulates structures in navigable waters and fill in waters of the United States. Its Nationwide Permits were reissued effective March 15, 2026. The state programmatic general permit SPGP VI reached its stated expiration date on July 27, 2026, so confirm the current federal path before relying on it.
5. Coastal Construction Control Line. Oceanfront work seaward of the CCCL generally needs an FDEP CCCL permit, and the state's seawall restoration exemption does not change that.

Local review can add steps of its own. In the City of St. Augustine, docks need Planning and Zoning Board approval and older buildings may need historic review. In unincorporated St. Johns County, Development Review makes CCCL determinations before building permit review. The Duval County and St. Johns County permit guides go further.

Working Directly With Barefoot Marine Construction

Florida Bulk Head is owned and operated by Barefoot Marine Construction, based at 10945 Patton Rd in Jacksonville. Barefoot serves Duval, St. Johns, Nassau, Clay, Flagler and Putnam counties directly, so a Northeast Florida request stays with the company that does the work. Every project follows the same five steps.

1. 1Request a QuoteCall (904) 821-5744 or send your project details with photos of the wall, cap and ground behind it, plus your waterway and any storm damage.
2. 2Site AssessmentThe wall, cap, backfill and toe are looked at in person, along with access, water depth and neighboring walls. Structural questions are flagged for a Florida-licensed professional engineer where needed.
3. 3Plan & PermitThe repair or replacement scope is defined, and the local, state and federal approvals that apply to your property are identified and obtained before construction starts.
4. 4Build or RepairWork proceeds under the approved plans and permit conditions, staged around tides, access and weather.
5. 5Protect Your PropertyYou get guidance on monitoring the wall and spotting early warning signs. The maintenance guide covers the basics.