Riprap Installation in Jacksonville, FL

Does Jacksonville Require Riprap?

We haven't found a City of Jacksonville rule that requires riprap at the base of every bulkhead. For most owners here it's a choice, not a mandate. What does apply is state and federal review, because rock placed in the water is fill in public waters. The city's own guidance on waterfront structures points owners to the Florida Department of Environmental Protection and/or the U.S. Army Corps of Engineers for permits. We confirm what your site needs before quoting.

Where riprap earns its keep:

• Open river frontage with long fetch across the St. Johns
• Intracoastal lots that take wake from steady boat traffic
• Walls with a scoured toe or exposed panel bottoms
• New or replacement bulkheads, where adding rock during construction is efficient

What Does Riprap Do?

A vertical wall reflects wave energy straight down, which digs out the base. That's scour, and once the toe is undermined, the wall starts to tip. Rock at the base:

• Absorbs and breaks up waves before they reach the wall
• Shields the toe from scour
• Reduces loads on the wall during storms
• Gives fish and crabs somewhere to live

Why Is Scour a Big Deal on the St. Johns?

The St. Johns flows north for 310 miles and is tidal far upstream. The UNF State of the River report says tidal flow is about seven times the freshwater discharge (UNF). That's a lot of water moving past your wall every day in both directions. Near the mouth, the daily range is close to 5 feet at Mayport on NOAA's datums, so the water line climbs and drops across the whole face of the wall. On the Intracoastal, the channel dug by the Army Corps in the 1940s to separate San Pablo Island from the mainland now carries constant boat traffic. Current plus wake is exactly what scours a toe.

How Is Riprap Installed?

1. Measure the toe. Water depth, scour, and the wall's condition.
2. Lay filter fabric. Geotextile stops soil from washing out through the rock.
3. Place the rock. Sized for your exposure and set on a stable slope, not dumped.
4. Keep the channel clear. We shape the apron around your dock and lift.
5. Check it. Slope, coverage and permit conditions.

Most residential jobs take a few days once permits are issued. Work from a barge keeps heavy equipment off your yard where water access allows.

How Much Does Riprap Cost in Jacksonville?

Riprap installation in Jacksonville typically runs $125–$350 per linear foot. A standard 75-foot residential installation costs $10,000–$25,000, fully installed and permitted. Rock size, water depth and access affect the price.

Riprap or Revetment?

Riprap in front of a wall protects the wall. A revetment is a rock slope that takes the place of a wall. If you already have one, see revetment maintenance in Jacksonville. If your wall needs replacing too, add rock during bulkhead replacement in Jacksonville. Our Jacksonville seawall repair page lists every local service, and our main riprap installation page explains the method in more depth. We also install riprap in St. Simons Island.