Marine Construction in Nassau County, Florida

Nassau County is the northernmost county we serve, taking in Amelia Island, Fernandina Beach and the mainland shoreline along the Amelia and Nassau rivers.

The waterfront here is strongly tidal and strongly saline, with extensive marsh frontage. Tidal range and current are significant, and both affect how structures are designed and where they fail.

The water in Nassau County

Conditions vary considerably within the county, which is why we assess exposure at your specific property rather than applying a county-wide answer.

• Amelia River — Strongly tidal with significant current. Scour is a primary consideration.
• Nassau River — Tidal and saline, with extensive marsh along much of its length.
• Intracoastal Waterway — Wake loading plus tidal current.
• Tidal creeks and marsh frontage — Lower wave energy, with bank stability and soil conditions the governing issues.

What this means for your structure

• Significant tidal range — structures must work across a large daily water level change.
• Strong tidal current contributing to toe scour at walls and around piles.
• High salinity, with marine borers a genuine consideration for timber.
• Extensive marsh frontage where erosion control approaches frequently suit better than a hard wall.

What we do in Nassau County

Everything we do elsewhere on the First Coast. The three services that make up most of our work:

• Bulkheads — construction, repair, replacement and storm damage
• Seawalls — construction, repair, chemical grout injection, concrete cap and wall repair and void filling and soil stabilization
• Dock construction — custom, residential, commercial and municipal, and repair and restoration

Plus pile driving and jacketing, boathouses and boat lifts, erosion control, inspections, permitting and debris removal and marina maintenance. The full service list is here.

Permitting in Nassau County

Work in Nassau County may involve Nassau County authorities alongside FDEP, the U.S. Army Corps of Engineers and the St. Johns River Water Management District.

Which agencies apply, and what each wants to see, depends on your site and scope — and the requirements are revised periodically. Treat this as orientation and confirm current requirements with each reviewing agency. We handle permitting on the projects we build, which is normally the longest item in a project schedule.