Haena, HI Coastal Erosion Rate
What USGS measures 0.6 miles east of Haena, HI
The coast 0.6 miles east of Haena, HI 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.
What "Haena" means on this page
Nothing here is parcel-level. USGS's raw transects run every few hundred feet along the shore; this page averages the ones nearest Haena, HI into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 22.22°N, 159.55°W. 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.
How solid is this number
This reading comes from 250 individual transects averaged together, 86% of which measured erosion rather than growth. USGS's confidence interval here is ±0.32 ft/yr. Taken at face value, this segment's raw -0.25 ft/yr reading would land it 439 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2011-1009. For scale: Seal Beach, CA, 2632 miles away, ranks 1072 of 1211 nationally for growth, 0.73 ft/yr. 0.5 miles up the coast, Haena, HI shows the same lack of a significant trend.
Not this whole stretch, just Haena itself: the Coastal Change Hazards Portal is USGS's own live version of this data.