Blue Point, NY Coastal Erosion Rate
Is the coast eroding 4.7 miles southeast of Blue Point, NY?
The coast 4.7 miles southeast of Blue Point, NY is actually gaining ground, not losing it: USGS's transects measure 0.57 feet of accretion a year here, sediment building up rather than washing away. At that rate, the shoreline has gained roughly 5.7 feet over the last decade.
What this reading actually covers
Nothing here is parcel-level. USGS's raw transects run every few hundred feet along the shore; this page averages the ones nearest Blue Point, NY into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 40.69°N, 73.00°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 0.57 ft/yr accretion rate 4.7 miles southeast of Blue Point, NY for 25 years would add roughly 14 feet of shoreline, again assuming nothing about the local sediment supply changes.
Where this fits nationally
This reading comes from 92 individual transects averaged together, 0% of which measured erosion rather than growth. Uncertainty on this specific number: 0.45 ft/yr either side. Among the 1211 US coastal segments with a measurable trend, this one ranks 1037 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS Open-File Report 2010-1119. For scale: Coronado, CA, 2483 miles away, ranks 1158 of 1211 nationally for growth, 2.04 ft/yr, 3.6x this stretch's rate. 2 miles away, Bayport, NY is the nearest other measured stretch: slight accretion (beach growing) at 0.83 ft/yr.
One address near Blue Point: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.