Kailua, HI Coastal Erosion Rate
Shoreline change 0.7 miles north of Kailua, HI
The coast 0.7 miles north of Kailua, HI is actually gaining ground, not losing it: USGS's transects measure 0.46 feet of accretion a year here, sediment building up rather than washing away. At that rate, the shoreline has gained roughly 4.6 feet over the last decade.
What "Kailua" means on this page
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 Kailua, HI. Centered near 21.41°N, 157.74°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.
25 years at this rate
Holding the 0.46 ft/yr accretion rate 0.7 miles north of Kailua, HI for 25 years would add roughly 12 feet of shoreline, again assuming nothing about the local sediment supply changes.
Where this fits nationally
This reading comes from 188 individual transects averaged together, 7% of which measured erosion rather than growth. The published margin on this reading runs ±0.22 ft/yr. Among the 1211 US coastal segments with a measurable trend, this one ranks 1014 for erosion, 1 being the fastest-retreating coast in the dataset. Source: USGS Open-File Report 2011-1009. Rockaway Beach, OR sits at national rank 1120 for growth (1.15 ft/yr), one reference point among the 1211 scored segments, 2536 miles from here. Kailua, HI, 2.1 miles off, is the adjacent measured stretch, itself no significant trend.
Kailua, HI on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.