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 NEXRAD · IEM
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.