Montauk's downtown beach erodes more slowly than the barrier reaches to the west — but it erodes toward a wall of motels built right on the sand. That's why the Army Corps buried 14,000 sand-filled bags under the beach in 2015–16. Here's the record.
Rates are the USGS National Assessment of Shoreline Change (Open-File Report 2010-1118/1119, Hapke et al.). Montauk's figure is modest because the trend is measured on a beach that has been repeatedly refilled; the exposure comes from what sits behind it. For the exact rate and base flood elevation at a specific parcel, see the address certificate.
Is Montauk losing its beach?
Yes, slowly — about 76% of USGS transects downtown erode long-term, averaging around −0.07 m/yr and reaching about −0.26 m/yr (−0.85 ft/yr) at the worst — modest next to Westhampton, but enough to threaten motels built on the sand.
What is the Montauk shoreline-change rate?
The USGS long-term rate downtown averages about −0.07 m/yr and reaches roughly −0.26 m/yr (about −0.85 ft/yr) at the fastest transect.
What is the Montauk sandbag dune?
The Army Corps' Downtown Montauk Stabilization Project buried roughly 14,000 sand-filled geotextile bags under about 3,100 feet of beach in front of the motels, completed in 2016 — and winter storms have repeatedly stripped the sand cover and exposed the bags.
What FEMA flood zone is Montauk's oceanfront in?
The downtown oceanfront is mapped Zone VE, the coastal high-hazard zone subject to breaking-wave action, in the FEMA National Flood Hazard Layer.
Downtown Montauk's motels sit at the toe of the beach, so even a slow retreat is an emergency for the buildings behind it. The federal response has been to hold the line with engineered sand — and, at the Point, with stone.
This page is the Montauk reach. 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.