Kekaha, HI Coastal Erosion Rate
Is the coast eroding 8.1 miles northwest of Kekaha, HI?
8.1 miles northwest of Kekaha, HI: USGS's transects didn't pick up a trend here that beats the survey's own uncertainty. That's the majority case nationally, and for this stretch specifically it means the coast is holding, not that the data failed to find anything.
What this reading actually covers
This is a roughly 3.5-mile stretch of coast, not one address or parcel - USGS's own transects run every few hundred feet, but that's finer than any one property needs, so this page reports the stretch nearest Kekaha, HI. Centered near 22.07°N, 159.77°W. 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.
Where this fits nationally
41 transects feed this segment's number; 100% of them individually measured retreat. USGS's confidence interval here is ±0.7 ft/yr. Taken at face value, this segment's raw -0.3 ft/yr reading would land it 403 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: Santa Monica, CA, 2628 miles away, ranks 1124 of 1211 nationally for growth, 1.21 ft/yr. 1.4 miles up the coast, Kekaha, HI shows the same lack of a significant trend.
Kekaha, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.