Dunedin, FL Coastal Erosion Rate
Shoreline change 3.5 miles northwest of Dunedin, FL
Good news, and an honest one: USGS's data can't distinguish this stretch, 3.5 miles northwest of Dunedin, FL, from a flat trend. Whatever small movement it measured here is statistical noise, not a reliable direction, so none is claimed.
What this reading actually covers
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 Dunedin, FL, rather than showing one arbitrary line. Segment center: 28.08, -82.83. 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 6 individual transects averaged together, 0% of which measured erosion rather than growth. The published margin on this reading runs ±7.97 ft/yr. The unadjusted figure here, 6.68 ft/yr, would place it 1207 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. For scale: Seal Beach, CA, 2116 miles away, ranks 1053 of 1211 nationally for growth, 0.63 ft/yr. 0.3 miles up the coast, Dunedin, FL shows the same lack of a significant trend.
Not this whole stretch, just Dunedin itself: the Coastal Change Hazards Portal is USGS's own live version of this data.