Narragansett Pier, RI Coastal Erosion Rate
Shoreline change 0.9 miles northeast of Narragansett Pier, RI
The coast 0.9 miles northeast of Narragansett Pier, RI has been retreating at a measured 0.22 feet a year, USGS's own long-term rate for this stretch, built from historical shoreline positions rather than a single survey. At that rate, the shoreline has lost roughly 2.2 feet over the last decade.
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 Narragansett Pier, RI. Centered near 41.44°N, 71.45°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 0.22 ft/yr holds for the next 25 years, the coast 0.9 miles northeast of Narragansett Pier, RI would retreat roughly 6 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 47 individual transects averaged together, 91% of which measured erosion rather than growth. USGS's confidence interval here is ±0.1 ft/yr. This segment ranks 483 of 1211 measured US coastal segments, ordered from fastest erosion to fastest growth. Source: USGS Open-File Report 2010-1119. Rank 224 nationally for erosion belongs to Kahuku, HI, 5065 miles from this stretch, measured at 0.79 ft/yr, 3.6x this stretch's rate. 2 miles away, Narragansett Pier, RI is the nearest other measured stretch: also no significant trend.
Narragansett Pier, RI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.