Haena, HI Coastal Erosion Rate
What USGS measures 1.2 miles west of Haena, HI
The coast 1.2 miles west 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.
The grain of this number
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, 159.58°W. 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
This reading comes from 58 individual transects averaged together, 98% of which measured erosion rather than growth. USGS's confidence interval here is ±0.42 ft/yr. Taken at face value, this segment's raw -0.23 ft/yr reading would land it 470 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2011-1009. Surfside Beach, TX sits at national rank 1059 for growth (0.69 ft/yr), one reference point among the 1211 scored segments, 3986 miles from here. Haena, HI, 1.4 miles off, is the adjacent measured stretch, itself no significant trend.
One address near Haena: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.