Rotonda, FL Coastal Erosion Rate
Is the coast eroding 4.1 miles south of Rotonda, FL?
Nothing alarming measured 4.1 miles south of Rotonda, FL: whatever shift USGS's transects picked up here is too small to call reliably one way or the other, which this site reports as "no significant trend" rather than forcing a direction.
What this reading actually covers
Rotonda, FL is the nearest named place, 4.1 miles away, to a ~3.5-mile stretch of coast USGS has surveyed - the reading below covers that whole stretch, not a single property in it. Segment center: 26.83, -82.27. 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 backs this reading up
This reading comes from 2 individual transects averaged together, 100% of which measured erosion rather than growth. USGS's confidence interval here is ±1.48 ft/yr. The unadjusted figure here, -1.22 ft/yr, would place it 180 of 1211 if ranked directly - but an unreliable rank isn't a useful one, which is exactly why "no significant trend" is the headline instead. Source: USGS Open-File Report 2004-1089. Rank 1193 nationally for growth belongs to North Wildwood, NJ, 945 miles from this stretch, measured at 4.21 ft/yr. 2.1 miles away, Rotonda, FL is the nearest other measured stretch: also no significant trend.
Rotonda, FL on the source map: try the Coastal Change Hazards Portal, zoomable well past this page's ~3.5-mile grain.