Riviera, TX Coastal Erosion Rate
Is the coast eroding 27.9 miles east of Riviera, TX?
The coast 27.9 miles east of Riviera, TX 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 Riviera, TX into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 27.35°N, 97.35°W. USGS's Gulf of Mexico assessment last surveyed this stretch through 2001, computing the rate with its LRR method. Other US regions were surveyed in different years, sometimes decades apart, so this page states its own rather than implying one national vintage.
Where this fits nationally
This reading comes from 112 individual transects averaged together, 20% of which measured erosion rather than growth. The published margin on this reading runs ±0.35 ft/yr. Taken at face value, this segment's raw 0.09 ft/yr reading would land it 841 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2004-1089. Longport, NJ sits at national rank 1168 for growth (2.33 ft/yr), one reference point among the 1211 scored segments, 1547 miles from here. Tierra Grande, TX, 3.1 miles off, is the adjacent measured stretch, itself no significant trend.
Riviera, TX on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.