North Eastham, MA Coastal Erosion Rate
Shoreline change 5.7 miles north of North Eastham, MA
0.83 feet a year: that is the measured retreat rate USGS's transects show for the coast 5.7 miles north of North Eastham, MA, averaged across the full historical record surveyed here. At that rate, the shoreline has lost roughly 8.3 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 North Eastham, MA into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 41.91°N, 69.98°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.
25 years at this rate
If 0.83 ft/yr holds for the next 25 years, the coast 5.7 miles north of North Eastham, MA would retreat roughly 21 more feet, a projection, not a certainty: erosion rates shift with storms, sediment supply and any armoring built in the meantime.
Where this fits nationally
55 transects feed this segment's number; 100% of them individually measured retreat. USGS's confidence interval here is ±0.21 ft/yr. This segment ranks 217 of 1211 measured US coastal segments, ordered from fastest erosion to fastest growth. Source: USGS Open-File Report 2010-1119. Rank 146 nationally for erosion belongs to Lewes, DE, 345 miles from this stretch, measured at 1.73 ft/yr, 2.1x this stretch's rate. North Eastham, MA, 1.8 miles off, is the adjacent measured stretch, reading slight erosion at 0.98 ft/yr.
One address near North Eastham: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.