Riprap & Seawall Toe Protection in Marco Island

Find out whether the toe is losing support

The city manual describes how loss of soil at the submerged toe can lead to wall rotation. It discusses riprap as a protective approach but also notes that rock occupies space and can interfere with docking. An underwater investigation may be necessary before the designer can establish the actual condition.

Do not infer a required rock size, slope or footprint from a general diagram. The wall, bottom conditions, vessel use and authorized work limits determine the design.

Marco Island Seawall Owner’s Manual (April 2014)

Measure the working waterway

Put the proposed rock footprint, dock, lift and boat movement on the same site plan. Form 31 calls for lot and waterway widths. Confirm whether the activity affects state submerged lands or protected habitat with DEP South District, and ask USACE about federal jurisdiction.

A private property boundary on an upland survey does not by itself authorize placing rock in the water. Preserve the agency determinations with the permit package.

City seawall permit application — Form 31 · DEP South District Permitting · USACE regulatory office locations

Keep permit costs separate from material quantities

The June 2026 city schedule lists shoring, riprap or reinforcement at $0.97 per linear foot with a $71 minimum. That is a base permit charge; it is not the cost of stone, delivery, placement or engineering.

Ask the contractor to identify design quantities, barge access, placement tolerances, inspection and disposal. Read the fee examples and habitat review guidance.

Signed Resolution 26-26: building permit fees

How do you compare two rock-placement proposals?

Ask for proposals based on the same design footprint and purpose. A quantity of rock alone does not show where it will go or what condition it is intended to address.

Investigation

What is known about the existing toe and bottom conditions? Identify underwater areas that remain unexamined.

Design and footprint

Show the intended work limits, relationship to the wall and dock, and space needed for vessel use. The project designer determines dimensions and material requirements.

Installation and verification

Ask how quantities, placement and the finished condition will be documented, and who checks the work against the approved design.

Access and follow-up

Include loading permission, barge trips, cleanup and a plan for any movement or erosion identified later.

If the wall also has panel or anchor damage, ask which separate work is required. Toe protection should have a defined role in the overall repair. For a shoreline with room for vegetation, compare a living or hybrid approach with the designer.

Marco Island Seawall Owner’s Manual (April 2014) · DEP South District Permitting