Kahului, HI Coastal Erosion Rate
Is the coast eroding 2.4 miles northeast of Kahului, HI?
The coast 2.4 miles northeast of Kahului, 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.
What this reading actually covers
Nothing here is parcel-level. USGS's raw transects run every few hundred feet along the shore; this page averages the ones nearest Kahului, HI into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 20.90°N, 156.45°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
Averaging 218 separate transects produced this segment's rate, with 67% individually reading as erosion, rather than relying on any single survey line. Uncertainty on this specific number: 0.51 ft/yr either side. Taken at face value, this segment's raw -0.27 ft/yr reading would land it 425 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2011-1009. For scale: Long Beach, WA, 2532 miles away, ranks 1202 of 1211 nationally for growth, 5.37 ft/yr. 2.8 miles away, Waihee-Waiehu, HI is the nearest other measured stretch: also no significant trend.
Kahului, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.