Anahola, HI Coastal Erosion Rate
Is the coast eroding 0.8 miles northeast of Anahola, HI?
Nothing alarming measured 0.8 miles northeast of Anahola, HI: 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
Anahola, HI is the nearest named place, 0.8 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: 22.15, -159.30. USGS's Hawaii assessment last surveyed this stretch through 2007-2010, computing the rate with its WLR method. Other US regions were surveyed in different years, sometimes decades apart, so this page states its own rather than implying one national vintage.
What backs this reading up
230 transects feed this segment's number; 82% of them individually measured retreat. USGS's confidence interval here is ±0.25 ft/yr. The unadjusted figure here, -0.18 ft/yr, would place it 527 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 2011-1009. Rank 1135 nationally for growth belongs to Long Beach, CA, 2616 miles from this stretch, measured at 1.31 ft/yr. Kapaa, HI, 3.8 miles off, is the adjacent measured stretch, itself no significant trend.
Anahola, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.