West Sayville, NY Coastal Erosion Rate
What USGS measures 4.7 miles southeast of West Sayville, NY
4.7 miles southeast of West Sayville, NY, the coast is advancing, not retreating, at a measured 0.66 feet a year, sediment accumulating faster than any erosion USGS recorded here. At that rate, the shoreline has gained roughly 6.6 feet over the last decade.
What this reading actually covers
This is a roughly 3.5-mile stretch of coast, not one address or parcel - USGS's own transects run every few hundred feet, but that's finer than any one property needs, so this page reports the stretch nearest West Sayville, NY. Centered near 40.67°N, 73.06°W. USGS's New England / Mid-Atlantic assessment last surveyed this stretch through 2007-2009, computing the rate with its LRR method. Other US regions were surveyed in different years, sometimes decades apart, so this page states its own rather than implying one national vintage.
25 years at this rate
Holding the 0.66 ft/yr accretion rate 4.7 miles southeast of West Sayville, NY for 25 years would add roughly 17 feet of shoreline, again assuming nothing about the local sediment supply changes.
What backs this reading up
56 transects feed this segment's number; 0% of them individually measured retreat. USGS's confidence interval here is ±0.34 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 1057 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS Open-File Report 2010-1119. Rank 1006 nationally for growth belongs to Dana Point, CA, 2484 miles from this stretch, measured at 0.44 ft/yr, 0.7x this stretch's rate. Bayport, NY, 1.4 miles off, is the adjacent measured stretch, reading slight accretion (beach growing) at 0.83 ft/yr.
Not this whole stretch, just West Sayville itself: the Coastal Change Hazards Portal is USGS's own live version of this data.