Urban Honolulu, HI Coastal Erosion Rate
Shoreline change 3.7 miles southeast of Urban Honolulu, HI
USGS's shoreline-change data puts this stretch, 3.7 miles southeast of Urban Honolulu, HI, at 0.24 feet of erosion a year on average, a long-term rate for this specific ~3.5-mile section, not one storm's damage. At that rate, the shoreline has lost roughly 2.4 feet over the last decade.
What "Urban Honolulu" means on this page
USGS surveys the coast in transects spaced a few hundred feet apart; this page groups the nearest ones into a single ~3.5-mile reading for the stretch closest to Urban Honolulu, HI, rather than showing one arbitrary line. Segment center: 21.28, -157.82. 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 0.24 ft/yr means over time
Run 3.7 miles southeast of Urban Honolulu, HI's 0.24 ft/yr rate forward 25 years and it implies about 6 feet of further retreat, assuming nothing changes, which is exactly the assumption a seawall or nourishment project exists to break.
How solid is this number
Averaging 7 separate transects produced this segment's rate, with 57% individually reading as erosion, rather than relying on any single survey line. USGS's confidence interval here is ±0.22 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 457 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS Open-File Report 2011-1009. West Hampton Dunes, NY sits at national rank 313 for erosion (0.46 ft/yr), one reference point among the 1211 scored segments, 5025 miles from here. Urban Honolulu, HI, 1.1 miles off, is the adjacent measured stretch, itself no significant trend.
One address near Urban Honolulu: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.