Nassau County · Northeast Florida
Jacksonville Dock Builder works throughout Fernandina Beach and Nassau County — on the Amelia River, Egans Creek, Lanceford Creek and the surrounding salt marsh, where one of Florida's larger tidal ranges makes floating sections and long elevated walkways the norm.
County
Nassau County
Primary waterways
Amelia River · Egans Creek · Lanceford Creek and Bells River · Nassau Sound and the southern marsh
ZIP codes served
32034 · 32035 · 32097
Local water
No two shorelines in Northeast Florida behave the same way. These are the conditions we design around here.
The Intracoastal channel running between Amelia Island and the mainland, with commercial and recreational traffic, genuine current and full salt water. Deep water is accessible on much of the frontage, but the marsh band in front of it usually is not short.
A tidal creek running the length of the island's eastern side through protected marsh. Shallow, sheltered and subject to significant exposure at low tide. Small-craft access and floating platforms suit it best.
Northern tidal creeks with broad marsh flats, soft bottoms and considerable tidal swing. Walkway length is the defining cost here.
Expansive marsh and shifting sand at the island's southern end, with strong tidal exchange and conditions that change meaningfully over time.
Most dock design decisions in Northeast Florida are about length. On Amelia Island they are about height.
Fernandina sits at the northern end of the Florida coast where the tidal range is at its largest in the state — commonly around six feet between high and low water. That is a different design problem from a two-foot swing, and it works through to almost every choice on the project.
On a fixed dock, the distance from the deck down to your boat changes by six feet over the course of a tide cycle. At high water you step across. At low water you are climbing down, with gear, onto a boat that is moving. For a lot of households that means the dock is comfortably usable for a few hours a day and awkward for the rest.
This is why floating platforms are so common on this frontage, and why gangway proportions matter more here than anywhere else we work. A float keeps the step constant. The gangway that gets you onto it has to be long enough that the walk down at the bottom of the tide is still a walk.
Nassau County waterfront is marsh country. Broad bands of spartina sit between most parcels and navigable water, and getting across them is the substantial part of nearly every project here.
That walkway is subject to real regulatory attention — typically conditions around how high above the marsh surface it must sit, how wide it may be, and how it is built so that the marsh underneath survives the construction. These are workable requirements, and we design to them from the outset rather than treating them as obstacles discovered in review.
What owners should understand at the planning stage is simply that the marsh crossing, not the dock at the end, is usually where the money goes.
Between full ocean salinity, very large tidal volumes and the constant wetting and drying that a six-foot range produces, this is demanding water.
Borers are active year-round. Hardware corrodes quickly. The volume of water moving through the creeks scours around pilings over time and reduces their grip. Timber in the splash zone gets the worst of every condition at once.
The response is not exotic: correct preservative retention for marine immersion, stainless connectors, embedment depth specified with scour in mind, and detailing that lets water drain instead of sit. Done properly, structures here last well. Done to an inland standard, they do not reach their tenth birthday in good shape.
Nassau County and City of Fernandina Beach building permits apply depending on the address, alongside state environmental review and federal authorisation from the U.S. Army Corps of Engineers Jacksonville District. Salt marsh crossings attract particular attention, and conditions on walkway height, width and construction method are common. Historic district properties may have an additional local review. We prepare and manage the submittals.
Requirements change. Confirm current rules with the Florida Department of Environmental Protection, the St. Johns River Water Management District and the U.S. Army Corps of Engineers Jacksonville District, along with your local building department.
Fernandina Beach answers
The tidal range. With something in the region of six feet between high and low water, the step from a fixed deck down to a boat changes dramatically through the day — comfortable at high tide and a serious climb at low. A floating platform keeps that step constant because it rises and falls with the water. On this frontage it is less a luxury than the thing that makes the dock usable for most of the tidal cycle.
It depends entirely on how wide the marsh band in front of your property is and where navigable water starts. On some Nassau County parcels it is modest; on others it is the overwhelming majority of the structure. We measure it on site rather than estimating, because it is the number that sets the budget.
Yes, and they are taken seriously. Walkways over marsh are commonly subject to conditions on minimum height above the marsh surface, maximum width, and how construction is carried out so the marsh underneath is not damaged. These are entirely workable requirements but they must be designed in from the beginning.
Longer than most people expect. Gangway length is calculated from the full tidal range and the steepest acceptable slope at low water. A gangway sized for mid-tide convenience becomes unpleasant and potentially unsafe at the bottom of the tide. On Fernandina frontage this is one of the specifications least worth economising on.
It is at the aggressive end. Full ocean salinity plus very large tidal volumes moving through the creeks twice a day means constant wetting, strong scour potential and fast corrosion of anything under-specified. Stainless hardware and correctly rated marine timber are the baseline here, not an upgrade.
Start your project
Tell us the waterway, what is there now and what you would like. We will come back with a clear scope.
