Madaket, MA Coastal Erosion Rate
What USGS measures 2.6 miles southeast of Madaket, MA
2.69 feet a year: that is the measured retreat rate USGS's transects show for the coast 2.6 miles southeast of Madaket, MA, averaged across the full historical record surveyed here. At that rate, the shoreline has lost roughly 26.9 feet over the last decade.
The grain of this number
Nothing here is parcel-level. USGS's raw transects run every few hundred feet along the shore; this page averages the ones nearest Madaket, MA into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 41.25°N, 70.15°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
If 2.69 ft/yr holds for the next 25 years, the coast 2.6 miles southeast of Madaket, MA would retreat roughly 67 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
This reading comes from 91 individual transects averaged together, 100% of which measured erosion rather than growth. The published margin on this reading runs ±0.3 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 104 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS Open-File Report 2010-1119. For scale: Boothville, LA, 1312 miles away, ranks 21 of 1211 nationally for erosion, 10.52 ft/yr, 3.9x this stretch's rate. 2.4 miles up the coast, Madaket, MA shows 3.49 ft/yr of eroding.
One address near Madaket: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.