Sagaponack, NY Coastal Erosion Rate
What USGS measures 0.8 miles southeast of Sagaponack, NY
The coast 0.8 miles southeast of Sagaponack, NY shows no statistically significant trend either way. USGS's transects measured a rate here, but it's smaller than the survey's own margin of error for this stretch, so calling it "eroding" or "growing" would overstate what the data actually shows.
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 Sagaponack, NY into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 40.92°N, 72.26°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.
Where this fits nationally
This reading comes from 50 individual transects averaged together, 100% of which measured erosion rather than growth. USGS's confidence interval here is ±0.29 ft/yr. Taken at face value, this segment's raw -0.29 ft/yr reading would land it 408 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2010-1119. Old Orchard Beach, ME sits at national rank 1132 for growth (1.28 ft/yr), one reference point among the 1211 scored segments, 206 miles from here. 1.5 miles up the coast, Sagaponack, NY shows 0.49 ft/yr of eroding.
Sagaponack, NY on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.