Laie, HI Coastal Erosion Rate
Is the coast eroding 1.2 miles northwest of Laie, HI?
The coast 1.2 miles northwest of Laie, 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 Laie, HI into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 21.66°N, 157.93°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
158 transects feed this segment's number; 38% of them individually measured retreat. The published margin on this reading runs ±0.17 ft/yr. Taken at face value, this segment's raw 0.01 ft/yr reading would land it 782 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2011-1009. Westhaven-Moonstone, CA sits at national rank 1151 for growth (1.85 ft/yr), one reference point among the 1211 scored segments, 2378 miles from here. 1.6 miles up the coast, Laie, HI shows the same lack of a significant trend.
Laie, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.