Kawela Bay, HI Coastal Erosion Rate
Is the coast eroding 0.5 miles west of Kawela Bay, HI?
Nothing alarming measured 0.5 miles west of Kawela Bay, 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 "Kawela Bay" means on this page
Kawela Bay, HI is the nearest named place, 0.5 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: 21.70, -158.01. Survey years: 2007-2010, method WLR, from USGS's Hawaii shoreline-change assessment. That's how current the data is here, real, but not a live feed, since a shoreline survey is a major undertaking, not an annual check-in.
What backs this reading up
This reading comes from 153 individual transects averaged together, 74% of which measured erosion rather than growth. Uncertainty on this specific number: 0.11 ft/yr either side. The unadjusted figure here, -0.06 ft/yr, would place it 700 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. Long Beach, CA sits at national rank 1089 for growth (0.89 ft/yr), one reference point among the 1211 scored segments, 2558 miles from here. Kawela Bay, HI, 2 miles off, is the adjacent measured stretch, itself no significant trend.
Kawela Bay, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.