Poipu, HI Coastal Erosion Rate
Shoreline change 0.6 miles south of Poipu, HI
The coast 0.6 miles south of Poipu, 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 "Poipu" 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 Poipu, HI into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 21.88°N, 159.46°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.
What backs this reading up
Averaging 81 separate transects produced this segment's rate, with 76% individually reading as erosion, rather than relying on any single survey line. The published margin on this reading runs ±0.15 ft/yr. Taken at face value, this segment's raw -0.12 ft/yr reading would land it 617 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2011-1009. Inverness, CA sits at national rank 959 for growth (0.27 ft/yr), one reference point among the 1211 scored segments, 2433 miles from here. Poipu, HI, 0.6 miles off, is the adjacent measured stretch, reading slight erosion at 0.32 ft/yr.
Not this whole stretch, just Poipu itself: the Coastal Change Hazards Portal is USGS's own live version of this data.