Edgartown, MA Coastal Erosion Rate
Shoreline change 3.9 miles southeast of Edgartown, MA
3.9 miles southeast of Edgartown, MA: USGS's transects didn't pick up a trend here that beats the survey's own uncertainty. That's the majority case nationally, and for this stretch specifically it means the coast is holding, not that the data failed to find anything.
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 Edgartown, MA. Centered near 41.36°N, 70.46°W. Survey years: 2007-2009, method LRR, from USGS's New England / Mid-Atlantic shoreline-change assessment. That's how current the data is here, real, but not a live feed, since a shoreline survey is a major undertaking, not an annual check-in.
How solid is this number
This reading comes from 97 individual transects averaged together, 61% of which measured erosion rather than growth. USGS's confidence interval here is ±0.98 ft/yr. Taken at face value, this segment's raw -0.07 ft/yr reading would land it 688 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2010-1119. For scale: Grayland, WA, 2636 miles away, ranks 1173 of 1211 nationally for growth, 2.4 ft/yr. Edgartown, MA, 2.8 miles off, is the adjacent measured stretch, itself no significant trend.
One address near Edgartown: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.