Narragansett Pier, RI Coastal Erosion Rate
What USGS measures 3.6 miles southwest of Narragansett Pier, RI
The coast 3.6 miles southwest of Narragansett Pier, RI shows no statistically significant trend either way. USGS's transects measured a rate here, but it's smaller than the survey's own margin of error for this stretch, so calling it "eroding" or "growing" would overstate what the data actually shows.
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 Narragansett Pier, RI into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 41.38°N, 71.50°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.
Where this fits nationally
This reading comes from 76 individual transects averaged together, 43% of which measured erosion rather than growth. USGS's confidence interval here is ±0.14 ft/yr. Taken at face value, this segment's raw 0.11 ft/yr reading would land it 859 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 1014 nationally for growth belongs to Kailua, HI, 5066 miles from this stretch, measured at 0.46 ft/yr. Narragansett Pier, RI, 1 miles off, is the adjacent measured stretch, reading slight erosion at 0.11 ft/yr.
One address near Narragansett Pier: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.