Makaha, HI Coastal Erosion Rate
Shoreline change 0.8 miles north of Makaha, HI
Good news, and an honest one: USGS's data can't distinguish this stretch, 0.8 miles north of Makaha, HI, from a flat trend. Whatever small movement it measured here is statistical noise, not a reliable direction, so none is claimed.
What this reading actually covers
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 Makaha, HI, rather than showing one arbitrary line. Segment center: 21.48, -158.22. 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 32 separate transects produced this segment's rate, with 53% individually reading as erosion, rather than relying on any single survey line. The published margin on this reading runs ±0.27 ft/yr. The unadjusted figure here, -0.01 ft/yr, would place it 764 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. Rank 1155 nationally for growth belongs to Seaside, OR, 2565 miles from this stretch, measured at 1.99 ft/yr. Makaha, HI, 1.4 miles off, is the adjacent measured stretch, itself no significant trend.
One address near Makaha: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.