Bellmore, NY Coastal Erosion Rate
Is the coast eroding 4.2 miles south of Bellmore, NY?
Nothing alarming measured 4.2 miles south of Bellmore, NY: 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.
What this reading actually covers
Bellmore, NY is the nearest named place, 4.2 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: 40.60, -73.50. 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.
How solid is this number
Averaging 88 separate transects produced this segment's rate, with 0% individually reading as erosion, rather than relying on any single survey line. Uncertainty on this specific number: 1.55 ft/yr either side. The unadjusted figure here, 0.47 ft/yr, would place it 1018 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. For scale: Dana Point, CA, 2462 miles away, ranks 1006 of 1211 nationally for growth, 0.44 ft/yr. Point Lookout, NY, 2.7 miles off, is the adjacent measured stretch, reading accretion (beach growing) at 4.23 ft/yr.
One address near Bellmore: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.