FLOOD-ZONE MAP FEMA NFHL · LIVE Where the high-risk flood zones are in Marathon
This is Marathon drawn live from FEMA’s National Flood Hazard Layer. Every shaded area is a
Special Flood Hazard Area — a high-risk zone where a federally backed mortgage requires flood
insurance, and the first thing a carrier checks after a water loss. Your homeowners policy does not cover
flood; that takes a separate NFIP or private flood policy. Pan and zoom to your street to see your zone.
FEMA FLOOD ZONES · MARATHON Loading live data…
Zone VE
Coastal high-hazard. Storm surge with waves on top — the most dangerous zone, along the open water.
Zone AE
The 1%-annual-chance floodplain (the “100-year” zone). FEMA sets a Base Flood Elevation here.
A / AH / AO
Other high-risk areas — shallow sheet flooding, ponding, or floodplain not yet studied in detail.
Unshaded (X)
Moderate-to-low risk — not no risk. Over a quarter of federal flood claims come from outside the high-risk zones.
Drawn live from FEMA’s National Flood Hazard Layer. Absence of shading is not a guarantee against flooding —
confirm your exact address at the
FEMA Map Service Center.
LIVE CONDITIONS NWS · NOAA · LIVE Radar, forecast & tides for Marathon
Live from the National Weather Service and NOAA — the local Doppler loop, the official 7-day forecast, and the
next high and low tides. Tides and surge timing decide how bad a coastal flood gets; a storm arriving at high
tide floods far more than the same storm at low tide.
DOPPLER RADAR · KBYXNWS RIDGE · ANIMATED
NEXT TIDESNOAA · Vaca Key, Florida Bay
Loading NOAA tide predictions…
MARINE FORECAST · BAYSIDE & GULFSIDE, CRAIG KEY TO SEVEN MILE BRIDGENWS
Loading NOAA coastal-waters forecast…
Source: NOAA National Weather Service & CO-OPS Tides & Currents — public domain. Tide heights are predictions
(datum MLLW), not observed water levels. During a storm, follow official NWS warnings, not this page.
How the risk changes across Marathon
Flood exposure is hyper-local. These are the broad patterns by area, keyed to FEMA zones and the way water
moves here — surge off the bay, the Monroe County river system, and low interior drainage. General
reference only; confirm your exact address on the map above.
Sombrero Beach VE / AE
STORM SURGE
Oceanfront on the south side of Vaca Key — VE beachfront, among the most surge-exposed ground on Marathon.
Coco Plum VE / AE
STORM SURGE
Oceanfront point on the Atlantic side; low and directly surge-exposed.
Boot Key / Boot Key Harbor AE
STORM SURGE
Harbor and mangrove island south of Vaca Key; tidal and surge flooding.
Key Colony Beach VE / AE
STORM SURGE
Separate incorporated island city adjacent to Marathon; canal-and-oceanfront, heavily VE/AE.
Grassy Key VE / AE
STORM SURGE
Northeast island of Marathon fronting the Atlantic; low and surge-exposed on both sides.
Duck Key VE / AE
STORM SURGE
Canal-island community northeast of Marathon; ringed by water and surge-exposed.
Vaca Cut / mid-Marathon canals AE
STORM SURGE
Gulf-access canal blocks through the middle of the island; surge pushes in from both sides.
Bayside (Florida Bay side) AE
STORM SURGE
North-facing Florida Bay frontage; surge and tidal flooding on the gulf side of the island.
LOCAL RESOURCES GOV · NOAA · FEMA Marathon disaster, insurance & mitigation resources
The official sources — emergency management, weather, insurance regulators, and property maps. Links open in a
new tab; agencies change their sites, so if one has moved, search the agency name.
Shelter, food & immediate help
Debris, cleanup & rebuilding
Maps, property & mitigation
Links to government & NOAA sources — public domain. Listing a resource is not endorsement. Flood zones and
elevations are general reference; confirm your exact address with the official source before acting.