Haleiwa, HI Coastal Erosion Rate
Is the coast eroding right at Haleiwa, HI?
The coast right at Haleiwa, 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 Haleiwa, HI into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 21.60°N, 158.10°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.
Where this fits nationally
This reading comes from 218 individual transects averaged together, 51% of which measured erosion rather than growth. The published margin on this reading runs ±0.19 ft/yr. Taken at face value, this segment's raw -0.01 ft/yr reading would land it 762 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2011-1009. Rank 1046 nationally for growth belongs to Mexico Beach, FL, 4492 miles from this stretch, measured at 0.6 ft/yr. 3.6 miles up the coast, Mokuleia, HI shows the same lack of a significant trend.
Not this whole stretch, just Haleiwa itself: the Coastal Change Hazards Portal is USGS's own live version of this data.