Iroquois Point, HI Coastal Erosion Rate
Shoreline change right at Iroquois Point, HI
Good news, and an honest one: USGS's data can't distinguish this stretch, right at Iroquois Point, HI, from a flat trend. Whatever small movement it measured here is statistical noise, not a reliable direction, so none is claimed.
What "Iroquois Point" 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 Iroquois Point, HI, rather than showing one arbitrary line. Segment center: 21.32, -157.97. 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
15 transects feed this segment's number; 100% of them individually measured retreat. USGS's confidence interval here is ±0.37 ft/yr. The unadjusted figure here, -0.25 ft/yr, would place it 440 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. Stone Harbor, NJ sits at national rank 1069 for growth (0.73 ft/yr), one reference point among the 1211 scored segments, 4952 miles from here. 1.3 miles up the coast, Ewa Beach, HI shows the same lack of a significant trend.
Not this whole stretch, just Iroquois Point itself: the Coastal Change Hazards Portal is USGS's own live version of this data.