Fire Island doesn't just erode — it migrates. It's a barrier island, gaining sand in some stretches and losing it fast near the inlets, and in 2012 Hurricane Sandy punched a new inlet clean through it that the Park Service chose to leave open. Here's what the record says.
Rates are the USGS National Assessment of Shoreline Change (Open-File Report 2010-1118/1119, Hapke et al.). A barrier island is the hardest shore to summarize with one number, because the sand is in motion along its length — which is exactly why a parcel-level read matters more here than a reach average. For your address, see the address certificate.
Is Fire Island eroding or growing?
Both — it's a mobile barrier, so about 55% of USGS transects erode while the rest hold or gain; some stretches build sand while shores near the inlets retreat as fast as −2.4 m/yr, and the Ocean Beach community erodes at about −0.37 m/yr.
What is the Fire Island shoreline-change rate?
USGS long-term rates range widely — from strong accretion near the west end to about −2.4 m/yr at the worst transect — while the Ocean Beach reach averages −0.37 m/yr (−1.2 ft/yr).
Is the Hurricane Sandy breach still open?
Yes — the Old Inlet breach Sandy opened on Oct. 29, 2012 sits inside the federally designated Otis Pike Fire Island High Dune Wilderness and was deliberately left open; the Park Service's 2017 plan lets it evolve naturally unless it threatens Great South Bay.
What FEMA flood zone is Fire Island in?
The oceanfront is mapped Zone VE, the coastal high-hazard zone, stepping down to Zone AE on the bayside, in the FEMA National Flood Hazard Layer.
Barrier islands migrate landward as the sea rises — it's how they survive. The policy question on Fire Island has been how much to fight that: hold the communities with sand, but let the wilderness behave like wilderness.
The open breach and the Great South Bay shore have their own live story — see Old Inlet — Great South Bay (live).
On a moving island the reach average hides a lot. The $99 Psammite certificate reads your exact address: the long-term erosion rate at your parcel, your storm-surge and FEMA exposure, the uncertainty band, and whether a licensed site review is warranted — built from the same federal record.