Urban Honolulu, HI Coastal Erosion Rate
What USGS measures 5.2 miles southeast of Urban Honolulu, HI
The coast 5.2 miles southeast of Urban Honolulu, 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 Urban Honolulu, HI into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 21.26°N, 157.80°W. The survey behind it runs to 2007-2010, in USGS's Hawaii assessment, using the WLR method. Shoreline surveys aren't repeated every year, so this is the most recent long-term measurement USGS has published for this coast, not a live reading.
What backs this reading up
Averaging 285 separate transects produced this segment's rate, with 68% individually reading as erosion, rather than relying on any single survey line. Uncertainty on this specific number: 0.19 ft/yr either side. Taken at face value, this segment's raw -0.05 ft/yr reading would land it 714 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 1104 nationally for growth belongs to Sanibel, FL, 4731 miles from this stretch, measured at 0.99 ft/yr. 1.7 miles up the coast, Urban Honolulu, HI shows 0.24 ft/yr of eroding.
Not this whole stretch, just Urban Honolulu itself: the Coastal Change Hazards Portal is USGS's own live version of this data.