Rotonda, FL Coastal Erosion Rate
What USGS measures 6.2 miles south of Rotonda, FL
The coast 6.2 miles south of Rotonda, FL 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 "Rotonda" means on this page
Nothing here is parcel-level. USGS's raw transects run every few hundred feet along the shore; this page averages the ones nearest Rotonda, FL into one ~3.5-mile reading rather than picking a single arbitrary line to represent the area. Centered near 26.80°N, 82.26°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 83 individual transects averaged together, 48% of which measured erosion rather than growth. USGS's confidence interval here is ±1.32 ft/yr. Taken at face value, this segment's raw 0.71 ft/yr reading would land it 1064 of 1211 nationally - a number worth ignoring, since it's statistical noise rather than a real trend. Source: USGS Open-File Report 2004-1089. Camp Pendleton South, CA sits at national rank 1005 for growth (0.44 ft/yr), one reference point among the 1211 scored segments, 2143 miles from here. 2.1 miles up the coast, Rotonda, FL shows the same lack of a significant trend.
One address near Rotonda: the Coastal Change Hazards Portal zooms past this stretch to the underlying map.