Ocean Bluff-Brant Rock, MA Coastal Erosion Rate
Shoreline change 0.8 miles south of Ocean Bluff-Brant Rock, MA
0.8 miles south of Ocean Bluff-Brant Rock, 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.
The grain of this number
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 Ocean Bluff-Brant Rock, MA. Centered near 42.09°N, 70.66°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.
How solid is this number
This reading comes from 95 individual transects averaged together, 46% of which measured erosion rather than growth. The published margin on this reading runs ±0.22 ft/yr. Taken at face value, this segment's raw 0 ft/yr reading would land it 770 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2010-1119. Rank 1067 nationally for growth belongs to Port St. Joe, FL, 1180 miles from this stretch, measured at 0.73 ft/yr. 2.2 miles away, Marshfield, MA is the nearest other measured stretch: also no significant trend.
Ocean Bluff-Brant Rock, MA on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.