Tiki Island, TX Coastal Erosion Rate
What USGS measures 8.5 miles east of Tiki Island, TX
8.5 miles east of Tiki Island, TX, the coast is advancing, not retreating, at a measured 2.15 feet a year, sediment accumulating faster than any erosion USGS recorded here. At that rate, the shoreline has gained roughly 21.5 feet over the last decade.
What "Tiki Island" 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 Tiki Island, TX, rather than showing one arbitrary line. Segment center: 29.33, -94.78. The survey behind it runs to 2001, in USGS's Gulf of Mexico assessment, using the LRR 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 2.15 ft/yr means over time
Holding the 2.15 ft/yr accretion rate 8.5 miles east of Tiki Island, TX for 25 years would add roughly 54 feet of shoreline, again assuming nothing about the local sediment supply changes.
How solid is this number
15 transects feed this segment's number; 0% of them individually measured retreat. The published margin on this reading runs ±1.09 ft/yr. This segment ranks 1161 of 1211 measured US coastal segments, ordered from fastest erosion to fastest growth. Source: USGS Open-File Report 2004-1089. Virginia Beach, VA sits at national rank 1017 for growth (0.47 ft/yr), one reference point among the 1211 scored segments, 1203 miles from here. 0.5 miles up the coast, Tiki Island, TX shows 6.14 ft/yr of accreting.
Not this whole stretch, just Tiki Island itself: the Coastal Change Hazards Portal is USGS's own live version of this data.