Kekaha, HI Coastal Erosion Rate
Is the coast eroding 3.2 miles northwest of Kekaha, HI?
The coast 3.2 miles northwest of Kekaha, 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 Kekaha, HI into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 21.99°N, 159.76°W. The survey behind it runs to 2007-2010, in USGS's Hawaii assessment, using the WLR method. Shoreline surveys aren't repeated every year, so this is the most recent long-term measurement USGS has published for this coast, not a live reading.
Where this fits nationally
294 transects feed this segment's number; 30% of them individually measured retreat. USGS's confidence interval here is ±1.26 ft/yr. Taken at face value, this segment's raw 0.14 ft/yr reading would land it 885 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: Camp Pendleton South, CA, 2684 miles away, ranks 1024 of 1211 nationally for growth, 0.49 ft/yr. Kekaha, HI, 2 miles off, is the adjacent measured stretch, itself no significant trend.
Kekaha, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.