Bulkhead & Seawall Repair in Jacksonville

Jacksonville is unusual among large American cities in how much of it is waterfront. The St. Johns River runs through the middle of it, and a dense network of tidal creeks and tributaries — the Trout, the Arlington, the Ortega, Pottsburg Creek and dozens of smaller ones — puts seawalls and bulkheads behind an enormous number of residential properties.

The defining characteristic for wall performance is that the St. Johns is tidal far inland. A wall in Ortega or Arlington experiences the same twice-daily water level change as one near the mouth, and that cycling is what drives most of the soil movement through walls here. Every cycle is an opportunity for water to move through a joint, and anything that opens a path gets exercised roughly 700 times a year.

Salinity varies considerably along the river. Downtown and downstream reaches are brackish to saline, which matters for steel corrosion and marine borer activity. Further upriver conditions are fresher, and timber walls tend to fare differently as a result. Two walls of the same age and material can be in very different condition depending on where along the river they sit.

Recreational boat traffic is heavy and its effect on walls is routinely underestimated. Sustained wake action works panel joints, mobilises sediment at the toe, and accelerates anything already loose. On busy stretches it is often the difference between a wall ageing quietly and a wall developing a problem.