Riprap and toe protection in Miami Beach

Signs the toe needs work

Look for these at low tide.

• A gap or hollow under the base of the wall
• Wall tipping toward the water
• Soil loss behind the wall with no visible crack
• Strong wakes or currents along the lot

Bay-side lots and the aquatic preserve

Lots that face open Biscayne Bay rather than a dredged canal sit on the Biscayne Bay Aquatic Preserve, which counts as Outstanding Florida Waters. There the state dock exemption is 500 sq ft of over-water area, and the preserve says manatees move into the bay in the cooler months.

Rock footprints are kept off grass beds, so a survey of the bottom comes before the rock order.[1][2][3]

Two permits, one elevation certificate

A Miami Beach seawall or dock job needs a City building permit with a site plan, structural plans and an elevation certification, plus Miami-Dade DERM Coastal Resources approval. FDEP and the Army Corps come in where the work reaches state or federal waters, which on the island canals is common.

Toe protection usually costs a fraction of a new wall and fits that permit route.[4]

What makes Miami Beach different

The city has about 55 miles of seawall, of which only about 5 miles are publicly owned, so most of it is the responsibility of private owners. Its seawall ordinance dates from Resolution R2016-4009 in May 2016, was strengthened in January 2021 and amended again in July 2025.[4][6]

Groundwater and flooding

The city notes that groundwater rises through the porous bedrock under Miami Beach, so a seawall alone cannot stop flooding. A raised wall stops tidal overtopping; drainage and flood protection handle the rest.[7]

Permits in Miami Beach

• City of Miami Beach Building Department: Building permit with a site plan, structural plans and an elevation certification.
• Miami-Dade DERM, Coastal Resources Section: Class I permit or exemption for seawalls, docks and lifts on the island canals and the bay, issued alongside the City permit. Phone (305) 372-6575.
• Florida DEP or South Florida Water Management District: State review where a dock or wall reaches open Biscayne Bay, part of the aquatic preserve, where FDEP's free online self-certification is not available.
• US Army Corps of Engineers, Jacksonville District: Federal authorisation for work in Biscayne Bay and Indian Creek; we confirm the small-project route since SPGP VI's stated July 2026 expiry.

What riprap does

Riprap is a sloped layer of large rock at the base of a seawall. It breaks wave energy and stops the water from scouring sand out from under the toe. Red mangroves can grow between the rocks, which is the idea behind living shorelines.

Riprap limits and permits

Under SPGP VI, new riprap may extend no more than 10 ft waterward of the mean high water line, and repair or replacement no more than 18 inches beyond the previous footprint. Miami-Dade allows natural limerock boulder riprap on a 2:1 slope up to 10 ft waterward through an expedited authorisation after inspection.[10][8]

Frequently asked questions