Longport, NJ Coastal Erosion Rate
What USGS measures 0.9 miles north of Longport, NJ
Nothing alarming measured 0.9 miles north of Longport, NJ: whatever shift USGS's transects picked up here is too small to call reliably one way or the other, which this site reports as "no significant trend" rather than forcing a direction.
The grain of this number
Longport, NJ is the nearest named place, 0.9 miles away, to a ~3.5-mile stretch of coast USGS has surveyed - the reading below covers that whole stretch, not a single property in it. Segment center: 39.32, -74.52. The survey behind it runs to 2007-2009, in USGS's New England / Mid-Atlantic assessment, using the LRR method. Shoreline surveys aren't repeated every year, so this is the most recent long-term measurement USGS has published for this coast, not a live reading.
Where this fits nationally
This reading comes from 16 individual transects averaged together, 100% of which measured erosion rather than growth. USGS's confidence interval here is ±0.41 ft/yr. The unadjusted figure here, -0.38 ft/yr, would place it 360 of 1211 if ranked directly - but an unreliable rank isn't a useful one, which is exactly why "no significant trend" is the headline instead. Source: USGS Open-File Report 2010-1119. Rank 1153 nationally for growth belongs to Orick, CA, 2577 miles from this stretch, measured at 1.86 ft/yr. 1.6 miles away, Margate City, NJ is the nearest other measured stretch: slight accretion (beach growing) at 0.8 ft/yr.
Not this whole stretch, just Longport itself: the Coastal Change Hazards Portal is USGS's own live version of this data.