Lahaina, HI Coastal Erosion Rate
What USGS measures 1.6 miles northwest of Lahaina, HI
Nothing alarming measured 1.6 miles northwest of Lahaina, HI: whatever shift USGS's transects picked up here is too small to call reliably one way or the other, which this site reports as "no significant trend" rather than forcing a direction.
What "Lahaina" means on this page
Lahaina, HI is the nearest named place, 1.6 miles away, to a ~3.5-mile stretch of coast USGS has surveyed - the reading below covers that whole stretch, not a single property in it. Segment center: 20.90, -156.69. 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.
How solid is this number
This reading comes from 317 individual transects averaged together, 79% of which measured erosion rather than growth. The published margin on this reading runs ±0.24 ft/yr. The unadjusted figure here, -0.08 ft/yr, would place it 675 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 1183 nationally for growth belongs to Quinby, VA, 4875 miles from this stretch, measured at 3.21 ft/yr. 2 miles away, Lahaina, HI is the nearest other measured stretch: also no significant trend.
Lahaina, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.