Laie, HI Coastal Erosion Rate
What USGS measures 0.4 miles south of Laie, HI
Good news, and an honest one: USGS's data can't distinguish this stretch, 0.4 miles south of Laie, HI, from a flat trend. Whatever small movement it measured here is statistical noise, not a reliable direction, so none is claimed.
What "Laie" means on this page
USGS surveys the coast in transects spaced a few hundred feet apart; this page groups the nearest ones into a single ~3.5-mile reading for the stretch closest to Laie, HI, rather than showing one arbitrary line. Segment center: 21.64, -157.92. 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
136 transects feed this segment's number; 71% of them individually measured retreat. USGS's confidence interval here is ±0.16 ft/yr. The unadjusted figure here, -0.08 ft/yr, would place it 676 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. For scale: Hogans Corner, WA, 2570 miles away, ranks 1205 of 1211 nationally for growth, 6.05 ft/yr. 1.6 miles away, Laie, HI is the nearest other measured stretch: also no significant trend.
Laie, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.